In
computing, a grayscale or greyscale
digital image is an image in which the value of each
pixel is a single
sample. Displayed images of this sort are typically composed of shades of
gray, varying from black at the weakest intensity to white at the strongest, though in principle the samples could be displayed as shades of any color, or even coded with various colors for different intensities. Grayscale images are distinct from
black-and-white images, which in the context of computer imaging are images with only two
colors,
black and
white; grayscale images have many shades of gray in between. In most contexts other than digital imaging, however, the term "black and white" is used in place of "grayscale"; for example, photography in shades of gray is typically called "black-and-white photography". The term
monochromatic in some digital imaging contexts is synonymous with grayscale, and in some contexts synonymous with black-and-white.
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<
graphics> (US "gray-scale") 1. Composed of (discrete) shades of grey. If the
pixels of a grey-scale
image have N
bits, they may take values from zero, representing black up to 2^N-1, representing white with intermediate values representing increasingly light shades of grey. If N=1 the image is not called grey-scale but could be called
monochrome.
2. A range of acurately known shades of grey printed out for use in calibrating those shades on a display or printer.
(1995-03-17)
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