For 24-bit color we have terms and definitions in 2 topics. The topics are Scanner and Technology.

24-bit color images are composed of three 8-bit color channels. Each color channel, similar to an 8-bit grayscale image, contains up to 256 colors. When combined, the red, green and blue channels provide up to 16.7 million colors. 24-bit color is also known as True Color and Photo-realistic Color.
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RGB color in which the level of each of the three primary colors in a pixel is represented by 8 bits of information. A 24-bit color image can contain over 16 million different colors. Not all computer monitors support 24-bit color, especially older models. Those that do not may use 8-bit color (256 colors) or 16-bit color (65,536 colors). Also called: true color. See also bit depth, pixel, RGB. Compare 16-bit color, 32-bit color.
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