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diff --git a/doc/chalk/using-filters.docbook b/doc/chalk/using-filters.docbook new file mode 100644 index 000000000..7dd8cf8d6 --- /dev/null +++ b/doc/chalk/using-filters.docbook @@ -0,0 +1,923 @@ +<chapter id="filters"> +<title>Filters</title> + +<para> +&chalk; comes with a number of filters. These can be used to enhance or +otherwise modify the image, either in whole or in part. Some filters are +applied directly, others are customizable, meaning that you are presented with +a dialog in which you can tune the result to your liking before the filter is +applied. If a selection is active, a filter is applied on the selected part of +the image. If no selection is active, the entire image is modified. +</para><para> +This chapter describes the available filters in detail. To make comparing the +filters easier, each filter has been applied to the same image and each description +contains a comparison image, showing the result of applying the filter described. +The original image (with thanks to the photographer, Christian Peper) is shown +below at half the original size. The sample images demonstrating the +results of applying the filters, with the original image at the left and the +modified image at the right, are shown at 25% of the original size. +</para> +<note><para>Some filters yield reasonable results for most images. For +other filters though, quite some tweaking needs to be done before the desired +outcome is achieved. If a filter does not do what you want, it might need +more or less customising. The examples in this chapter are exaggerated to +give a good impression of the filters. You will usually want to have more +<quote>gentle</quote> modifications.</para></note> +<para> +Tip: If you want to apply a filter to everything except a certain part of your +image (for example, you want to desaturate your image except for the centre), +select the part you do not want to apply the filter to, use the +<menuchoice><guimenu>Select</guimenu><guimenuitem>Invert</guimenuitem></menuchoice> +menu option, and then apply the filter. +</para> +<para> +See the <link linkend="commands-dialogs-filters">Dialogs for working with +filters</link> section for descriptions of the settings available for the +customizable filters. +</para> + +<screenshot> +<screeninfo>The original image</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The original image</phrase> +</textobject> +<caption><para>The original image</para></caption> +</mediaobject> +</screenshot> + +<sect1 id="filters-autocontrast"> +<title>The Auto Contrast filter</title> +<para> +The Auto Contrast filter changes the contrast of your image to what should be +the best settings. Usually this works out fine, but in some cases (for example +photos taken under unusual lighting circumstances), the filter will not yield +satisfying results. +</para> +<para> +You can find the Auto Contrast filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Adjust</guisubmenu></menuchoice> menu. This filter is not customizable. +</para> +<screenshot> +<screeninfo>The image with the Auto Contrast filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-autocontrast.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Auto Contrast filter applied to it</phrase> +</textobject> +<caption><para>The image with the Auto Contrast filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-blur"> +<title>The Blur filter</title> +<para> +You can use the Blur filter to blur your image (give it a fuzzy look). +</para> +<para> +You can find the filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Blur</guisubmenu></menuchoice> menu. +See the section on <link linkend="commands-dialogs-filters-blur">the +<guilabel>Blur</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Blur filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-blur.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Blur filter applied to it</phrase> +</textobject> +<caption><para>The image with the Blur filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-brightnesscontrast"> +<title>The Brightness / Contrast filter</title> +<para> +With this filter, you can adjust the brightness and contrast of your image. +</para> +<para> +You can find the filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Adjust</guisubmenu></menuchoice> menu. +See the section on <link +linkend="commands-dialogs-filters-brightnesscontrast">the +<guilabel>Brightness / Contrast</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Brightness / Contrast filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-brightnesscontrast.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Brightness / Contrast filter applied to it</phrase> +</textobject> +<caption><para>The image with the Brightness / Contrast filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-bumpmap"> +<title>The Bumpmap filter</title> +<para> +The Bumpmap filter takes two layers and uses one of these to convert the other +one so that it will give an illusion of depth. The object layer (the layer to be +transformed) is the actual layer that should receive the three-dimensional +looks. The bumpmap layer is a grayscale layer, which is read and used to +determine the height for each point of the object layer. Alternatively, the +same layer can be used as both object layer and bumpmap layer. +</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-bumpmap">the +<guilabel>Bumpmap</guilabel> dialog</link> for more information on its +settings. +</para> +<screenshot> +<screeninfo>The image with the Bumpmap filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-bumpmap.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Bumpmap filter applied to it</phrase> +</textobject> +<caption><para>The image with the Bumpmap filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-cimg"> +<title>The CImg Image Restoration filter</title> +<para> +With this filter, you can perform minor enhancements to your image, for +example removing small scratches or adding a slight blur. The difference +between our sample original image and the result of applying this filter with +standard settings is virtually none. +</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-imagerestoration">the +<guilabel>Image Restoration</guilabel> dialog</link> +for more information on its settings. +</para> +</sect1> + +<sect1 id="filters-coloradjustment"> +<title>The Color Adjustment filter</title> +<para> +This filter allows you to change the looks of your image by increasing or +decreasing the abundance of certain colors. +</para> +<para> +You can find the filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Adjust</guisubmenu></menuchoice> menu. +See the section on <link +linkend="commands-dialogs-filters-coloradjustment">the +<guilabel>Color Adjustment</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Color Adjustment filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-coloradjustment.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Color Adjustment filter applied to it</phrase> +</textobject> +<caption><para>The image with the Color Adjustment filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-colortoalpha"> +<title>The Color to Alpha filter</title> +<para> +This filter changes a color or color range in your image to become +transparent, effectively clearing regions with those colors. +</para> +<para> +You can find the filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Colors</guisubmenu></menuchoice> menu. +See the section on <link +linkend="commands-dialogs-filters-colortoalpha">the +<guilabel>Color to Alpha</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Color to Alpha filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-colortoalpha.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Color to Alpha filter applied to it</phrase> +</textobject> +<caption><para>The image with the Color to Alpha filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-colortransfer"> +<title>The Color Transfer filter</title> +<para> +With this filter, you can re-color an image using the colors from another +image. Each color in your current image will be replaced by the most alike +color used in the other image. +</para> +<para> +You can find the filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Colors</guisubmenu></menuchoice> menu. +See the section on <link +linkend="commands-dialogs-filters-colortransfer">the +<guilabel>Color Transfer</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Color Transfer filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-colortransfer.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Color Transfer filter applied to it</phrase> +</textobject> +<caption><para>The image with the Color Transfer filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-customconvolution"> +<title>The Custom Convolution filter</title> +<para> +This filter allows you to distort your image by setting a number of +parameters. +</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-customconvolution">the +<guilabel>Custom Convolution</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Custom Convolution filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-customconvolution.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Custom Convolution filter applied to it</phrase> +</textobject> +<caption><para>The image with the Custom Convolution filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-desaturate"> +<title>The Desaturate filter</title> +<para> +This filter converts your image to grayscale by setting the saturation of each +pixel's color to zero. +</para> +<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 Desaturate filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-desaturate.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Desaturate filter applied to it</phrase> +</textobject> +<caption><para>The image with the Desaturate filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-edgedetection"> +<title>The Edge Detection filters</title> +<para> +These filters try to detect <quote>edges</quote> (boundaries) in the picture +and modify the image such that only these edges retain their respective colors, +while the rest of the image is turned gray. Through the use of lighting the +image will then get a three-dimensional look. +</para><para> +There are four edge detection filters available. Each of these detects edges +from a different side (possibly considering other parts of the image as being +edges) and will therefore obtain a different resulting image. +</para> +<para> +You can find the filters in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Edge Detection</guisubmenu></menuchoice> menu. +These filters are not customizable. +</para> +<screenshot> +<screeninfo>The image with the Bottom Edge Detection filter applied to +it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-edgebottom.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Bottom Edge Detection filter applied to it</phrase> +</textobject> +<caption><para>The image with the Bottom Edge Detection filter applied to +it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-emboss"> +<title>The Emboss filters</title> +<para> +Emboss filters work somewhat like edge detection filters, with the difference +that embossed images are entirely gray. Areas in the picture are detected and +are given a certain <quote>height level</quote>, which is made visible by using +grayscale borders, making the image look like it is three-dimensional. +</para> +<para> +You can find the filters in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Emboss</guisubmenu></menuchoice> menu. +Except for the Emboss with Variable Depth filter, these filters are not +customizable. See the section on <link +linkend="commands-dialogs-filters-emboss">the +<guilabel>Emboss</guilabel> dialog</link> +for more information on the settings of the Emboss with Variable Depth filter. +</para> +<screenshot> +<screeninfo>The image with the Emboss in All Directions filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-embossall.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Emboss in All Directions filter applied to it</phrase> +</textobject> +<caption><para>The image with the Emboss in All Directions filter applied to +it</para></caption> +</mediaobject> +</screenshot> +<screenshot> +<screeninfo>The image with the Emboss with Variable depth filter applied to +it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-embossvariable.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Emboss with Variable depth filter applied to it</phrase> +</textobject> +<caption><para>The image with the Emboss with Variable depth filter applied to +it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-gaussianblur"> +<title>The Gaussian Blur filter</title> +<para> +This filter makes the image a little fuzzy by blurring it in a pseudo-random +way. A gaussian algorithm is used for finding the extent to which each part of +the image should be blurred. +</para> +<para> +You can find the filter in the <menuchoice><guimenu>Filter</guimenu> +<guisubmenu>Blur</guisubmenu></menuchoice> menu. +This filter is not customizable. +</para> +<screenshot> +<screeninfo>The image with the Gaussian Blur filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-gaussianblur.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Gaussian Blur filter applied to it</phrase> +</textobject> +<caption><para>The image with the Gaussian Blur filter applied to +it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-gaussiannoise"> +<title>The Gaussian Noise Reduction filter</title> +<para> +With this filter, you can remove noise from your image. +</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-gaussiannoise">the +<guilabel>Gaussian Noise Reduction</guilabel> dialog</link> +for more information on its settings. +</para> +<screenshot> +<screeninfo>The image with the Gaussian Noise Reduction filter applied to it</screeninfo> +<mediaobject> +<imageobject> +<imagedata fileref="crocusses-gaussiannoise.png" format="PNG" /> +</imageobject> +<textobject> +<phrase>The image with the Gaussian Noise Reduction filter applied to it</phrase> +</textobject> +<caption><para>The image with the Gaussian Noise Reduction filter applied to it</para></caption> +</mediaobject> +</screenshot> +</sect1> + +<sect1 id="filters-invert"> +<title>The Invert filter</title> +<para> +This filter inverts all colors. The Red, Green and Blue component of each pixel +are taken and subtracted from 255. This means that red becomes cyan, green +becomes purple, and blue becomes yellow. The resulting values form the new +pixel color. +</para> +<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> |