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Computing (FOLDOC) dictionary
true colour
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graphics A system where the red, green, and blue components
of a colour are stored in display memory, as opposed to
storing logical colours and using a colour palette to
convert them to red, green, blue components.
The advantage of true colour over a palette is that it does
not restrict the range of colours which can be displayed on
screen simultaneously. For example, if eight bits are used to
store each component of each pixel then a total of 2^24
(about 17 million) different colours can be displayed at once
which would require a (very expensive) palette with 3 * 2^24
bytes (about 50 megabytes) of memory.