Bit Depth

The number of bits used by a graphic input or output device to display the color value of a pixel. Graphic cards in computers work with bit depths of up to 24 bit. For example, they have 8 bits available for coding each of the three color components – red, green and blue – in the RGB mode and can display 224 color values or roughly 16.7 million colors. Modern scanners often have bit depths of 30 bits or more.

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