Palette

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A color palette, or simply palette (also known as a "colormap" or "color index"), is a lookup table of color values. It most frequently used for simple image compression, but can also be used for other purposes. For example, GoldSrc reads from a palette to know what color to render legacy particle effects from Quake.

Uses:

• Most stuff in Quake and Quake II
• Per-image compression in GoldSrc
• Particle effects and WON console in GoldSrc
• 

infected in Left 4 Dead 2