Bit-depth meaning

(computer graphics) The number of bits (binary digits) used to represent the colour of a single pixel.

A bit depth of eight corresponds to a palette of 256 possible colours, because 28 = 256.

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The maximum numeric value in a coding system. The bit depth is the maximum number of bits in the system's storage element and represents either the total number of discrete items that can be represented or the largest magnitude. For example, the bit depth of an audio sample determines its dynamic range (see audio bit depth). The bit depth of a screen pixel determines the total number of colors that can be displayed (see color depth). See bit specifications and binary values.
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Alternative spelling of bit depth.
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