The ability to generate 32,768 colors (15 bits) or 65,536 colors (16-bit). 15-bit color uses five bits for each red, green and blue pixel. The 16th bit may be a color, such as XGA with 5-red, 6-green ...

The number of bits used to hold a screen pixel. Also called "pixel depth" and "bit depth," the color depth is the maximum number of colors that can be displayed. True Color (24-bit color) is required ...

While there's definitely a visible difference between 16 and 32 bit color, i doubt that there will ever be consumer level cards with 64 bit color. 24 bits is enough to produce more colors than the ...