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the Bit depth
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A bit depth is a number of bits used to represent the colour of a single pixel.
A bitmap is a series of bits which represents a rasterized graphic image, each pixel being represented as a group of bits.
256, 8 bits per pixel = 2^8 colours.
formula to find compression ratio when bits per pixel is given
bit depth
8
The number of pixels that can be displayed The number of bits used to represent each pixel The dot pitch of the monitor
24 bits/pixel: one byte for red, one byte for green, one byte for blue.
Most modern digital cameras use 24 bits (8 bits per primary) to represent a color. But more or less can be used, depending on the quality desired. Many early computer graphics cards used only 4 bits to represent a color.
30kb = ? pixel?