Representation: YUV, CLUT

• The YUV encoding scheme can provide similar quality in a color image representation using 16 bits, as compared to 24 bpp in an RGB representation.
• This YUV encoding assumes 4:2:2 subsampling. Thus, a 2x2 block of pixels will have the luminance represented by 4 bytes for Y, but only 2 bytes for each of the two color components (U, V).
• CLUT uses a color lookup table. The size of the table determines the number of bits needed for a pixel, so a 256 entry table requires 8 bits, a 128 entry table requires 7 bits, and a 16 entry requires 4 bits.
• The colors in the CLUT are either standard or default values, as from a system palette, or a special set chosen to optimize display of an image --- the best set of colors so each pixel is as close as possible to the original.