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As of 2018, 24-bit color depth is used by virtually every computer and phone display [citation needed] and the vast majority of image storage formats. Almost all cases of 32 bits per pixel assigns 24 bits to the color, and the remaining 8 are the alpha channel or unused. 2 24 gives 16,777,216 color variations.
Often known as truecolor and millions of colors, 24-bit color is the highest color depth normally used, and is available on most modern display systems and software. Its color palette contains (2 8) 3 = 256 3 = 16,777,216 colors. 24-bit color can be represented with six hexadecimal digits.
High-end digital image equipment are often able to deal with larger integer ranges for each primary color, such as 0..1023 (10 bits), 0..65535 (16 bits) or even larger, by extending the 24 bits (three 8-bit values) to 32-bit, 48-bit, or 64-bit units (more or less independent from the particular computer's word size).
In some uses, hexadecimal color codes are specified with notation using a leading number sign (#). [1] [2] A color is specified according to the intensity of its red, green and blue components, each represented by eight bits. Thus, there are 24 bits used to specify a web color within the sRGB gamut, and 16,777,216 colors that may be so specified.
2-, 4-, 8-, 16- and 32-color standard graphic modes, EHB 64-color and HAM 4096-color enhanced modes; 2 to 64 color modes pick from a 4096-color master palette (4 bits for each of red, green, and blue), with 64 color mode constructed from 32 normally chosen colors plus a second set of 32 fixed at half the intensity of the first.
This layout became popular when 24-bit color (and 32-bit RGBA) was introduced on personal computers. At the time it was much faster and easier for programs to manipulate one 32-bit unit than four 8-bit units. On little-endian systems, this is equivalent to BGRA byte order. On big-endian systems, this is equivalent to ARGB byte order.
Usually the color is represented by all 16 bits, but some devices also support 15-bit high color. [1] In Windows 7, Microsoft used the term high color to identify display systems that can make use of more than 8-bits per color channel (10:10:10:2 or 16:16:16:16 rendering formats) from traditional 8-bit per color channel formats. [2]
The color map table of the BMP file format indexed color mode stores its entries in BGR order rather than RGB, and has (in the current version) an additional unused byte for padding to conform to 32-bit word alignment during processing, but it is essentially still a 24-bit RGB color encoding. (An earlier version of the BMP format used three ...