Blame Manuals/en/LaTeX/Distribution/Backgrounds/introduction.tex

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The Backgrounds directory is probably the Themes' core compoent.
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Inside Backgrounds/ directory you produce background images that are
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reused by almost all theme's art works (e.g., Distribution, Websites,
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Promotion, etc.).  
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The Backgrounds/ directory structure can contain directories to help
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you organize the design process. 
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    Img/: In this directory is where you store all background images
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          (e.g., .png, .jpg, .xpm, etc.).  This directory is required
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          by rendering scripts.
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    Tpl/: In this directory is where you store all scalable vector
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          graphics (e.g., .svg) files. This directory is required by
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          rendering scripts.
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    Xcf/: In this directory is where you store all Gimp's project
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          files (e.g, .xcf). This directory is optional. If you can
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          create a beautiful background images using scalable vector
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          graphics only, then there is no need to use Gimp to produce
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          background images. Of course, you can merge Gimp's power
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          with Inkscape's power to produce images based on them.  In
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          this last case you need this directory.
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Inside Backgrounds/ you can create your vectorial designs using
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Inkscape and your background images using Gimp. Later you can export
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your background image as png and load it in your vectorial design
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using Inkscape's import feautre.  Note that you may need to repeat
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this technic for different screen resoluions. In that case you need to
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create one file for each screen resolution and do the appropriate
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linking inside .svg to .png files.  For example if you need to produce
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background images in 800x600 you need to create the following file:
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    xcf/800x600.xcf
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to produce the background image:
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    img/800x600-bg.png
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which is loaded in: 
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    svg/800x600.svg
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to produce the final background image:
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    img/800x600.png         
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The img/800x600.png background image is produced automatically by
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means of rendering scripts.
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In other cases, like Anaconda's, it is possible that you need to make
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some variations to one background image that don't want to appear on
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regular background images of the same resolution. In this case you
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need to create a new and specific background image for that art
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component.  For example, if you need to produce the background image
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used by Anconda (800x600) art works you create the file:
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    xcf/800x600-anaconda.xcf
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to produce the background image:
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    img/800x600-anaconda-bg.png
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which is loaded in: 
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    svg/800x600-anaconda.svg
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to produce the file:
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    img/800x600-anaconda.png
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The 800x600-anaconda.png file is used by all Anaconda art works
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sharing a common 800x600 screen resolution (e.g., Header, Progress,
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Splash, Firstboot, etc.). The Anaconda Prompt is indexed to 16 colors
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and 640x480 pixels so you need to create a 640x480 background image
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for it, and take the color limitation into account when designing it.
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Background images without artistic motif are generally used as based
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to build the Background images that do contain the theme's artistic
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motif. 
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Background images are linked (using Inkscape's \textit{import}
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feature) inside almost all theme art works. This structure let you
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make centralized changes on the visual identity and propagate them
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quickly to other areas. 
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In this structure you design background images for different screen
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resolutions based on theme's artistic motif.
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