rgb2pct(1)
NAME
rgb2pct - .TH "rgb2pct" 1 "Sun Sep 5 2010" "GDAL"
NAME
rgb2pct - 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>