True ColorTrue Color describes bitmaps where the color of each pixel is defined by three separate 8 bit (range 0 to 255) Red, Green and Blue values (see RGB).
Although normally 24 bits are used for storing color information, in many cases, a further 8 bits (making a total of 32 bits) are allocated for each pixel, and are either unused, or used for storing alpha transparency (see Alpha Channel) information.
The main alternatives to storing color images in True Color are Deep Color (where 30 bits or more are used for each each pixel's color information), High Color (where 16 bits are used for each pixel's color information), or the use of a lower color depth in combination with a palette specifying a more limited choice of possible colors to use in the image. When a palette is used, the information stored for each pixel is simply an index into the the palette, selecting one of the colors from the selection available.
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