/usr/bin/rgb2pct.py is in python-gdal 2.2.3+dfsg-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#******************************************************************************
# $Id: rgb2pct.py 33790 2016-03-26 12:42:12Z goatbar $
#
# Name: rgb2pct
# Project: GDAL Python Interface
# Purpose: Application for converting an RGB image to a pseudocolored image.
# Author: Frank Warmerdam, warmerdam@pobox.com
#
#******************************************************************************
# Copyright (c) 2001, Frank Warmerdam
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#******************************************************************************
import os.path
import sys
from osgeo import gdal
def Usage():
print('Usage: rgb2pct.py [-n colors | -pct palette_file] [-of format] source_file dest_file')
sys.exit(1)
# =============================================================================
# Mainline
# =============================================================================
color_count = 256
format = 'GTiff'
src_filename = None
dst_filename = None
pct_filename = None
gdal.AllRegister()
argv = gdal.GeneralCmdLineProcessor( sys.argv )
if argv is None:
sys.exit( 0 )
# Parse command line arguments.
i = 1
while i < len(argv):
arg = argv[i]
if arg == '-of':
i = i + 1
format = argv[i]
elif arg == '-n':
i = i + 1
color_count = int(argv[i])
elif arg == '-pct':
i = i + 1
pct_filename = argv[i]
elif src_filename is None:
src_filename = argv[i]
elif dst_filename is None:
dst_filename = argv[i]
else:
Usage()
i = i + 1
if dst_filename is None:
Usage()
# Open source file
src_ds = gdal.Open( src_filename )
if src_ds is None:
print('Unable to open %s' % src_filename)
sys.exit(1)
if src_ds.RasterCount < 3:
print('%s has %d band(s), need 3 for inputs red, green and blue.' \
% (src_filename, src_ds.RasterCount))
sys.exit(1)
# Ensure we recognise the driver.
dst_driver = gdal.GetDriverByName(format)
if dst_driver is None:
print('"%s" driver not registered.' % format)
sys.exit(1)
# Generate palette
ct = gdal.ColorTable()
if pct_filename is None:
err = gdal.ComputeMedianCutPCT( src_ds.GetRasterBand(1),
src_ds.GetRasterBand(2),
src_ds.GetRasterBand(3),
color_count, ct,
callback = gdal.TermProgress,
callback_data = 'Generate PCT' )
else:
pct_ds = gdal.Open(pct_filename)
ct = pct_ds.GetRasterBand(1).GetRasterColorTable().Clone()
# Create the working file. We have to use TIFF since there are few formats
# that allow setting the color table after creation.
if format == 'GTiff':
tif_filename = dst_filename
else:
import tempfile
tif_filedesc,tif_filename = tempfile.mkstemp(suffix='.tif')
gtiff_driver = gdal.GetDriverByName( 'GTiff' )
tif_ds = gtiff_driver.Create( tif_filename,
src_ds.RasterXSize, src_ds.RasterYSize, 1)
tif_ds.GetRasterBand(1).SetRasterColorTable( ct )
# ----------------------------------------------------------------------------
# We should copy projection information and so forth at this point.
tif_ds.SetProjection( src_ds.GetProjection() )
tif_ds.SetGeoTransform( src_ds.GetGeoTransform() )
if src_ds.GetGCPCount() > 0:
tif_ds.SetGCPs( src_ds.GetGCPs(), src_ds.GetGCPProjection() )
# ----------------------------------------------------------------------------
# Actually transfer and dither the data.
err = gdal.DitherRGB2PCT( src_ds.GetRasterBand(1),
src_ds.GetRasterBand(2),
src_ds.GetRasterBand(3),
tif_ds.GetRasterBand(1),
ct,
callback = gdal.TermProgress,
callback_data = 'Generate PCT' )
tif_ds = None
if tif_filename != dst_filename:
tif_ds = gdal.Open( tif_filename )
dst_driver.CreateCopy( dst_filename, tif_ds )
tif_ds = None
os.close(tif_filedesc)
gtiff_driver.Delete( tif_filename )
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