dithering
<data, algorithm> A technique used in quantisation processes such as
graphics and audio to reduce or remove the correlation between noise and signal.
Dithering is used in computer graphics to create additional colors and shades
from an existing palette by interspersing pixels of different colours. On a
monochrome display, areas of grey are created by varying the proportion of black
and white pixels. In colour displays and printers, colours and textures are
created by varying the proportions of existing colours. The different colours
can either be distributed randomly or regularly. The higher the resolution of
the display, the smoother the dithered colour will appear to the eye.
Dithering doesn't reduce resolution. There are three types: regular dithering
which uses a very regular predefined pattern; random dither where the pattern is
a random noise; and pseudo random dither which uses a very large, very regular,
predefined pattern.
Dithering is used to create patterns for use as backgrounds, fills and shading,
as well as for creating halftones for printing. When used for printing is it
very sensitive to paper properties. Dithering can be combined with rasterising.
It is not related to anti-aliasing.
(2003-07-20)
Nearby terms:
distribution « distributive lattice « disusered «
dithering » Ditto Drive » diverge » divisor
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