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924 lines
31 KiB
924 lines
31 KiB
<chapter id="filters">
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<title>Filters</title>
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<para>
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&chalk; comes with a number of filters. These can be used to enhance or
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otherwise modify the image, either in whole or in part. Some filters are
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applied directly, others are customizable, meaning that you are presented with
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a dialog in which you can tune the result to your liking before the filter is
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applied. If a selection is active, a filter is applied on the selected part of
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the image. If no selection is active, the entire image is modified.
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</para><para>
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This chapter describes the available filters in detail. To make comparing the
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filters easier, each filter has been applied to the same image and each description
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contains a comparison image, showing the result of applying the filter described.
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The original image (with thanks to the photographer, Christian Peper) is shown
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below at half the original size. The sample images demonstrating the
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results of applying the filters, with the original image at the left and the
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modified image at the right, are shown at 25% of the original size.
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</para>
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<note><para>Some filters yield reasonable results for most images. For
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other filters though, quite some tweaking needs to be done before the desired
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outcome is achieved. If a filter does not do what you want, it might need
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more or less customising. The examples in this chapter are exaggerated to
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give a good impression of the filters. You will usually want to have more
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<quote>gentle</quote> modifications.</para></note>
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<para>
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Tip: If you want to apply a filter to everything except a certain part of your
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image (for example, you want to desaturate your image except for the centre),
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select the part you do not want to apply the filter to, use the
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<menuchoice><guimenu>Select</guimenu><guimenuitem>Invert</guimenuitem></menuchoice>
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menu option, and then apply the filter.
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</para>
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<para>
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See the <link linkend="commands-dialogs-filters">Dialogs for working with
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filters</link> section for descriptions of the settings available for the
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customizable filters.
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</para>
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<screenshot>
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<screeninfo>The original image</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The original image</phrase>
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</textobject>
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<caption><para>The original image</para></caption>
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</mediaobject>
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</screenshot>
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<sect1 id="filters-autocontrast">
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<title>The Auto Contrast filter</title>
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<para>
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The Auto Contrast filter changes the contrast of your image to what should be
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the best settings. Usually this works out fine, but in some cases (for example
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photos taken under unusual lighting circumstances), the filter will not yield
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satisfying results.
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</para>
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<para>
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You can find the Auto Contrast filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Adjust</guisubmenu></menuchoice> menu. This filter is not customizable.
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</para>
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<screenshot>
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<screeninfo>The image with the Auto Contrast filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-autocontrast.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Auto Contrast filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Auto Contrast filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-blur">
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<title>The Blur filter</title>
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<para>
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You can use the Blur filter to blur your image (give it a fuzzy look).
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Blur</guisubmenu></menuchoice> menu.
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See the section on <link linkend="commands-dialogs-filters-blur">the
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<guilabel>Blur</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Blur filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-blur.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Blur filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Blur filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-brightnesscontrast">
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<title>The Brightness / Contrast filter</title>
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<para>
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With this filter, you can adjust the brightness and contrast of your image.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Adjust</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-brightnesscontrast">the
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<guilabel>Brightness / Contrast</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Brightness / Contrast filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-brightnesscontrast.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Brightness / Contrast filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Brightness / Contrast filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-bumpmap">
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<title>The Bumpmap filter</title>
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<para>
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The Bumpmap filter takes two layers and uses one of these to convert the other
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one so that it will give an illusion of depth. The object layer (the layer to be
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transformed) is the actual layer that should receive the three-dimensional
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looks. The bumpmap layer is a grayscale layer, which is read and used to
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determine the height for each point of the object layer. Alternatively, the
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same layer can be used as both object layer and bumpmap layer.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Map</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-bumpmap">the
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<guilabel>Bumpmap</guilabel> dialog</link> for more information on its
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settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Bumpmap filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-bumpmap.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Bumpmap filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Bumpmap filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-cimg">
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<title>The CImg Image Restoration filter</title>
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<para>
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With this filter, you can perform minor enhancements to your image, for
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example removing small scratches or adding a slight blur. The difference
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between our sample original image and the result of applying this filter with
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standard settings is virtually none.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-imagerestoration">the
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<guilabel>Image Restoration</guilabel> dialog</link>
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for more information on its settings.
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</para>
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</sect1>
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<sect1 id="filters-coloradjustment">
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<title>The Color Adjustment filter</title>
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<para>
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This filter allows you to change the looks of your image by increasing or
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decreasing the abundance of certain colors.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Adjust</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-coloradjustment">the
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<guilabel>Color Adjustment</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Color Adjustment filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-coloradjustment.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Color Adjustment filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Color Adjustment filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-colortoalpha">
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<title>The Color to Alpha filter</title>
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<para>
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This filter changes a color or color range in your image to become
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transparent, effectively clearing regions with those colors.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Colors</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-colortoalpha">the
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<guilabel>Color to Alpha</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Color to Alpha filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-colortoalpha.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Color to Alpha filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Color to Alpha filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-colortransfer">
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<title>The Color Transfer filter</title>
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<para>
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With this filter, you can re-color an image using the colors from another
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image. Each color in your current image will be replaced by the most alike
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color used in the other image.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Colors</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-colortransfer">the
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<guilabel>Color Transfer</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Color Transfer filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-colortransfer.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Color Transfer filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Color Transfer filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-customconvolution">
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<title>The Custom Convolution filter</title>
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<para>
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This filter allows you to distort your image by setting a number of
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parameters.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-customconvolution">the
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<guilabel>Custom Convolution</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Custom Convolution filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-customconvolution.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Custom Convolution filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Custom Convolution filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-desaturate">
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<title>The Desaturate filter</title>
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<para>
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This filter converts your image to grayscale by setting the saturation of each
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pixel's color to zero.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Adjust</guisubmenu></menuchoice> menu.
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This filter is not customizable.
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</para>
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<screenshot>
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<screeninfo>The image with the Desaturate filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-desaturate.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Desaturate filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Desaturate filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-edgedetection">
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<title>The Edge Detection filters</title>
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<para>
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These filters try to detect <quote>edges</quote> (boundaries) in the picture
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and modify the image such that only these edges retain their respective colors,
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while the rest of the image is turned gray. Through the use of lighting the
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image will then get a three-dimensional look.
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</para><para>
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There are four edge detection filters available. Each of these detects edges
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from a different side (possibly considering other parts of the image as being
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edges) and will therefore obtain a different resulting image.
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</para>
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<para>
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You can find the filters in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Edge Detection</guisubmenu></menuchoice> menu.
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These filters are not customizable.
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</para>
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<screenshot>
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<screeninfo>The image with the Bottom Edge Detection filter applied to
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it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-edgebottom.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Bottom Edge Detection filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Bottom Edge Detection filter applied to
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it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-emboss">
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<title>The Emboss filters</title>
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<para>
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Emboss filters work somewhat like edge detection filters, with the difference
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that embossed images are entirely gray. Areas in the picture are detected and
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are given a certain <quote>height level</quote>, which is made visible by using
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grayscale borders, making the image look like it is three-dimensional.
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</para>
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<para>
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You can find the filters in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Emboss</guisubmenu></menuchoice> menu.
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Except for the Emboss with Variable Depth filter, these filters are not
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customizable. See the section on <link
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linkend="commands-dialogs-filters-emboss">the
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<guilabel>Emboss</guilabel> dialog</link>
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for more information on the settings of the Emboss with Variable Depth filter.
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</para>
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<screenshot>
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<screeninfo>The image with the Emboss in All Directions filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-embossall.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Emboss in All Directions filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Emboss in All Directions filter applied to
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it</para></caption>
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</mediaobject>
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</screenshot>
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<screenshot>
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<screeninfo>The image with the Emboss with Variable depth filter applied to
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it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-embossvariable.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Emboss with Variable depth filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Emboss with Variable depth filter applied to
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it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-gaussianblur">
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<title>The Gaussian Blur filter</title>
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<para>
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This filter makes the image a little fuzzy by blurring it in a pseudo-random
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way. A gaussian algorithm is used for finding the extent to which each part of
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the image should be blurred.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Blur</guisubmenu></menuchoice> menu.
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This filter is not customizable.
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</para>
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<screenshot>
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<screeninfo>The image with the Gaussian Blur filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-gaussianblur.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Gaussian Blur filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Gaussian Blur filter applied to
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it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-gaussiannoise">
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<title>The Gaussian Noise Reduction filter</title>
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<para>
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With this filter, you can remove noise from your image.
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</para>
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<para>
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You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
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<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
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See the section on <link
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linkend="commands-dialogs-filters-gaussiannoise">the
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<guilabel>Gaussian Noise Reduction</guilabel> dialog</link>
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for more information on its settings.
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</para>
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<screenshot>
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<screeninfo>The image with the Gaussian Noise Reduction filter applied to it</screeninfo>
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<mediaobject>
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<imageobject>
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<imagedata fileref="crocusses-gaussiannoise.png" format="PNG" />
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</imageobject>
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<textobject>
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<phrase>The image with the Gaussian Noise Reduction filter applied to it</phrase>
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</textobject>
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<caption><para>The image with the Gaussian Noise Reduction filter applied to it</para></caption>
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</mediaobject>
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</screenshot>
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</sect1>
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<sect1 id="filters-invert">
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<title>The Invert filter</title>
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<para>
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This filter inverts all colors. The Red, Green and Blue component of each pixel
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are taken and subtracted from 255. This means that red becomes cyan, green
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becomes purple, and blue becomes yellow. The resulting values form the new
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pixel color.
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</para>
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<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Adjust</guisubmenu></menuchoice> menu.
|
|
This filter is not customizable.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Invert filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-invert.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Invert filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Invert filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-lenscorrection">
|
|
<title>The Lens Correction filter</title>
|
|
<para>
|
|
This filter can fix distortions in your image resulting from for example
|
|
<quote>pincushion</quote> lens effects, and modify some lighting.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Other</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-lenscorrection">the
|
|
<guilabel>Lens Correction</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Lens Correction filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-lenscorrection.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Lens Correction filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Lens Correction filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-maximizechannel">
|
|
<title>The Maximize Channel filter</title>
|
|
<para>
|
|
This filter gives each pixel in your image a new color: only the color channel
|
|
that contributes the most to the color of a pixel is retained (except for
|
|
gray pixels, which are kept gray).
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Colors</guisubmenu></menuchoice> menu.
|
|
This filter is not customizable.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Maximize Channel filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-maximizechannel.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Maximize Channel filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Maximize Channel filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-meanremoval">
|
|
<title>The Mean Removal filter</title>
|
|
<para>
|
|
This filter sharpens the image by changing the colors of neighboring pixels
|
|
with approximately the same color, so that small differences are evened out.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
|
|
This filter is not customizable.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Mean Removal filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-meanremoval.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Mean Removal filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Mean Removal filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-minimizechannel">
|
|
<title>The Minimize Channel filter</title>
|
|
<para>
|
|
This filter gives each pixel in your image a new color: the color channel
|
|
that contributes the most to the color of a pixel is removed (except for
|
|
gray pixels, which are kept gray).
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Colors</guisubmenu></menuchoice> menu.
|
|
This filter is not customizable.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Minimize Channel filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-minimizechannel.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Minimize Channel filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Minimize Channel filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-oilpaint">
|
|
<title>The Oilpaint filter</title>
|
|
<para>
|
|
An oilpaint effect is given to the image by creating patch-shaped areas in which
|
|
the most important color is applied to the entire area.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Artistic</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-oilpaint">the
|
|
<guilabel>Oilpaint</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Oilpaint filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-oilpaint.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Oilpaint filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Oilpaint filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-pixelize">
|
|
<title>The Pixelize filter</title>
|
|
<para>
|
|
The image is pixelated by taking a square area and giving it the mean color
|
|
value of the pixels it contains.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Artistic</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-pixelize">the
|
|
<guilabel>Pixelize</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Pixelize filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-pixelize.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Pixelize filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Pixelize filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-raindrops">
|
|
<title>The Raindrops filter</title>
|
|
<para>
|
|
This filter makes it look like raindrops have fallen on the image by distorting
|
|
drop-shaped areas with a lens-like effect as one would see when looking
|
|
at the image through a real raindrop. Some raindrops will have a fish-eye lens
|
|
effect.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Artistic</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-raindrops">the
|
|
<guilabel>Raindrops</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Raindrops filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-raindrops.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Raindrops filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Raindrops filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-randomnoise">
|
|
<title>The Random Noise filter</title>
|
|
<para>
|
|
With this filter, random noise can be added to your image.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Other</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-randomnoise">the
|
|
<guilabel>Random Noise</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Random Noise filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-randomnoise.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Random Noise filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Random Noise filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-randompick">
|
|
<title>The Random Pick filter</title>
|
|
<para>
|
|
This filter distorts the image by interchanging pixels.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Other</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-randompick">the
|
|
<guilabel>Random Pick</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Random Pick filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-randompick.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Random Pick filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Random Pick filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-roundcorners">
|
|
<title>The Round Corners filter</title>
|
|
<para>
|
|
This filter just rounds off the corners of the image. This is done by making
|
|
the outside of the rounded corner transparent.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Map</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-roundcorners">the
|
|
<guilabel>Round Corners</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Round Corners filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-roundcorners.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Round Corners filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Round Corners filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-sharpen">
|
|
<title>The Sharpen filter</title>
|
|
<para>
|
|
This filter sharpens the image.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
|
|
This filter is not customizable.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Sharpen filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-sharpen.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Sharpen filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Sharpen filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-smalltiles">
|
|
<title>The Small Tiles filter</title>
|
|
<para>
|
|
The picture is reduced in size and repeated multiple times.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Map</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-smalltiles">the
|
|
<guilabel>Small Tiles</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Small Tiles filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-smalltiles.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Small Tiles filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Small Tiles filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-sobel">
|
|
<title>The Sobel filter</title>
|
|
<para>
|
|
This is a more enhanced edge detection filter.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Edge Detection</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-sobel">the
|
|
<guilabel>Sobel</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Sobel filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-sobel.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Sobel filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Sobel filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-unsharpmask">
|
|
<title>The Unsharp Mask filter</title>
|
|
<para>
|
|
This filter sharpens part of your image. (The name <quote>unsharp</quote> is
|
|
historical: parts would be masked off while the rest would be made less sharp.)
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-unsharpmask">the
|
|
<guilabel>Unsharp Mask</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Unsharp Mask filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-unsharpmask.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Unsharp Mask filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Unsharp Mask filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-wave">
|
|
<title>The Wave filter</title>
|
|
<para>
|
|
This filter transforms your image into a wave shape.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Other</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-wave">the
|
|
<guilabel>Wave</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Wave filter applied to it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-wave.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Wave filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Wave filter applied to it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
<sect1 id="filters-waveletnoise">
|
|
<title>The Wavelet Noise Reduction filter</title>
|
|
<para>
|
|
This filter reduces noise in the image by giving loose pixels a color close to
|
|
the surrounding area. This causes small details to be lost, but can enhance the
|
|
general view of the image when this is hampered by too many unnecessary details.
|
|
</para>
|
|
<para>
|
|
You can find the filter in the <menuchoice><guimenu>Filter</guimenu>
|
|
<guisubmenu>Enhance</guisubmenu></menuchoice> menu.
|
|
See the section on <link
|
|
linkend="commands-dialogs-filters-waveletnoise">the
|
|
<guilabel>Wavelet Noise Reduction</guilabel> dialog</link>
|
|
for more information on its settings.
|
|
</para>
|
|
<screenshot>
|
|
<screeninfo>The image with the Wavelet Noise Reduction filter applied to
|
|
it</screeninfo>
|
|
<mediaobject>
|
|
<imageobject>
|
|
<imagedata fileref="crocusses-waveletnoise.png" format="PNG" />
|
|
</imageobject>
|
|
<textobject>
|
|
<phrase>The image with the Wavelet Noise Reduction filter applied to it</phrase>
|
|
</textobject>
|
|
<caption><para>The image with the Wavelet Noise Reduction filter applied to
|
|
it</para></caption>
|
|
</mediaobject>
|
|
</screenshot>
|
|
</sect1>
|
|
|
|
|
|
</chapter>
|