One example of such a display buffer is the 16-color EGA graphics adapter on older IBM PC's and compatibles. Most text modes on color displays are still limited to the same 8 or 16 colors. Generally, red and green are assigned 3 bits each while blue is assigned 2 bits, due to a limitation on the number of blue shades perceived by the human eye. A typical 8-bit frame buffer is small enough to fit within one megabyte of frame memory, and 256 colors is sufficient for most casual graphics use. The common GIF graphics format, for instance, is an 8-bit graphics mode, and is quite versatile.
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This is more than enough for professional graphics work, and any natural shade can be replicated within the phosphor limits of the display. The JPEG standard is a 24-bit graphics format. All rights reserved. Pseudocolor and Lookup Tables One common work-around to the demanding memory requirements of true color displays is the lookup table or LUT architecture. The LUT extends the number of colors that can be displayed by a given number of bit planes.