TH QUANTIZE 9.1
SH NAME
3to1, mcut, improve, quantize, dither \- picture color compression
SH SYNOPSIS
B fb/3to1
[
B -e
]
I colormap
[
I input
]
PP
B fb/mcut
[
I input
]
PP
B fb/improve
I colormap
[
I input
]
PP
B fb/quantize
[
I input
]
PP
B fb/dither
[
I input
]
SH DESCRIPTION
I 3to1
approximates the full color (3 bytes per pixel) or mapped (1 byte per pixel,
possibly with a colormap) input picture file in
one byte per pixel using the given
IR colormap .
If no
I input
file is named, the
picture is read from standard input.  The
B -e
option suppresses the default error-diffusion dither.
PP
I Mcut
writes a color map, suitable for use by
I 3to1
on its standard output.  The color map
is computed using the median-cut algorithm
and represents reasonably well, but not
necessarily optimally, the colors
of the input picture.
PP
I Improve
reads a color map and a picture and writes
on standard output a new color map that better
represents the colors of the picture.
Multiple passes of
I improve
may produce better and better color maps.
PP
I Quantize
is an
I rc
script that packages all of the above to compress the full-color
input image to one byte per pixel.
PP
I Dither
likewise compresses full-color images to one byte per pixel.
It uses a fixed color map that allows a speedy algorithm;
I quantize
instead runs slower but gives better results.
SH SOURCE
B /sys/src/fb/3to1.c
br
B /sys/src/fb/mcut.c
br
B /sys/src/fb/improve.c
br
B /sys/src/fb/quantize.r
br
B /sys/src/fb/dither.c
SH "SEE ALSO
IR picfile (9.6),
IR cmap (9.6)

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