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SPOFLT38.A57_README_GLOSSARY.DOC
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1995-03-23
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GLOSSARY OF IMAGE PROCESSING TERMS
==================================
This document is (c) Copyright 1994-1995, Stuart Denman.
All rights reserved.
This document may only be included with Speed of Light(tm) Image
Processor and may be reproduced only for personal reference.
DITHERING - Using a pattern of dots to create the illusion of another color or
shade. A minimum of two colors must be used in the dot pattern.
FILTERED IMAGE SCALING (FIS) - A process applied to an image where each
pixel's neighboring pixels can have an effect on its color and/or intensity
based on the filter used.
FIXED COLORMAP - A palette in which fixed amounts of red, green, and blue are
used to try to cover the full palette. No fine shades are presented so
dithering must be used to account for these losses.
GAMMA-CORRECTION - A function used to brighten or darken an image which is
more "true to life" than just uniformly increasing all the intensities.
HISTOGRAM - A "graph" of sorts that shows some value versus the intensity of
color. The histogram "of an image" shows which intensities are most abundant
in the image. A transformation histogram maps one intensity of color to
another intensity. There are other kinds of histograms used in Speed of
Light.
INVERSE COLORMAP - Given an arbitrary input color defined by a red, green, and
blue value, an inverse colormap allows you to efficiently determine which color
in the image best represents that input color. The higher the resolution of the
inverse colormap, the more accurately the representative color can be
determined. 5 bits of resolution is usually good enough for most purposes.
INVERSION OF THE COLORMAP - Dark colors in the palette are mapped to light
colors and visa-versa.
MONOCHROME - Two colors, usually black and white.
OCTREE - A fast data structure that is used for color quantization.
PIXEL - Picture element. One "dot" on the screen or in the image.
QUANTIZATION - Reduction of colors. An example is from truecolor to 256 color.
TRUECOLOR - An image where no palette exists, each pixel is defined individually
so that there are virtually an unlimited number of colors.