Color knowledge-what is the number of colors?
The field of color depth computer graphics represents the number of bits used to store 1 pixel of color in a bitmap or video frame buffer. It is also known as bit / pixel (bpp). The higher the color depth, the more colors are available.
The color depth is described by "n-bit colour". If the color depth is n bits, there are 2n color choices, and the number of bits used to store each pixel is n. Common ones are:
Monochrome: black and white.
2 digits: 4 colors for CGA.
4 bits: 16 colors, used for CGA, EGA and VGA.
8-bit gray scale: There are 256 levels between black, gray and white.
15 or 16-bit color (high color): The three primary colors used by the computer are red, green and blue. In the 15-bit color, each primary color has 25 = 32 levels, a total of 32768 colors; and in the 16-bit color, green has 26 = 64, a total of 65536 colors.
24-bit color (true color): each primary color has 256 levels, and their combination has 256 * 256 * 256 colors.
32-bit color: In addition to 24-bit color, the additional 8 bits are used to store graphics data (alpha channel) of overlapping layers.
There is also a High Dynamic Range Image, which uses more than the usual 256 color levels to store the image. Generally speaking, each pixel is allocated to 32 + 32 + 32 bits to store color information, that is, Say that for each primary color a 32-bit floating point number is used for storage.
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