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There are several issues to consider when changing colors on your system. Colors are available from a color database. The scocolor client, a convenient tool for previewing colors and changing the color appearance of the Graphical Environment, makes available the colors that are provided by this database, as well as hundreds of other colors that you can create yourself.
The color database is based on the RGB (Red/Green/Blue) color model. The scocolor client is based on the RGB color model, but also provides the option of using the HSV (Hue/Saturation/Value) color model as an alternative.
While the color database provides hundreds of colors, there are limits on the number of different colors that you can actually display at the same time. The severity of this limitation depends on the X server you are using and, consequently, on the size of your system colormap.
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