03/18/2003
15-462 Graphics I
12
Fewer Bits: Colormaps
•Colormaps typical for 8 bit framebuffer depth
•With screen 1024 * 768 = 786432 = 0.75
MB
•Each pixel value is index into colormap
•Colormap is array of RGB values, 8 bits each
•All 224 colors can be represented
•Only 28 = 256 at a time
•Poor approximation of full color
•Who owns the colormap?
•Colormap hacks: affect image w/o
changing framebuffer (only colormap)