NAME
rgb2pct - rgb2pct.py Convert a 24bit RGB image to 8bit paletted
SYNOPSIS
rgb2pct.py [-n colors] [-of format] source_file dest_file
DESCRIPTION
This utility will compute an optimal pseudo-color table for a given RGB
image using a median cut algorithm on a downsampled RGB histogram. Then
it converts the image into a pseudo-colored image using the color
table. This conversion utilizes Floyd-Steinberg dithering (error
diffusion) to maximize output image visual quality.
-n colors:
Select the number of colors in the generated color table. Defaults
to 256. Must be between 2 and 256.
-of format:
Format to generated (defaults to GeoTIFF). Same semantics as the
-of flag for gdal_translate. Only output formats supporting
pseudocolor tables should be used.
source_file:
The input RGB file.
dest_file:
The output pseudo-colored file that will be created.
NOTE: rgb2pct.py is a Python script, and will only work if GDAL was
built with Python support.
AUTHORS
Frank Warmerdam <warmerdam@pobox.com>