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#!/usr/bin/env python
# ******************************************************************************
# $Id: rgb2pct.py 8e263710cb425c4a8b76b1f363b98be41ea0a983 2018-04-30 19:40:20 +1000 Ben Elliston $
#
# 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)
def DoesDriverHandleExtension(drv, ext):
exts = drv.GetMetadataItem(gdal.DMD_EXTENSIONS)
return exts is not None and exts.lower().find(ext.lower()) >= 0
def GetExtension(filename):
ext = os.path.splitext(filename)[1]
if ext.startswith('.'):
ext = ext[1:]
return ext
def GetOutputDriversFor(filename):
drv_list = []
ext = GetExtension(filename)
for i in range(gdal.GetDriverCount()):
drv = gdal.GetDriver(i)
if (drv.GetMetadataItem(gdal.DCAP_CREATE) is not None or
drv.GetMetadataItem(gdal.DCAP_CREATECOPY) is not None) and \
drv.GetMetadataItem(gdal.DCAP_RASTER) is not None:
if ext and DoesDriverHandleExtension(drv, ext):
drv_list.append(drv.ShortName)
else:
prefix = drv.GetMetadataItem(gdal.DMD_CONNECTION_PREFIX)
if prefix is not None and filename.lower().startswith(prefix.lower()):
drv_list.append(drv.ShortName)
# GMT is registered before netCDF for opening reasons, but we want
# netCDF to be used by default for output.
if ext.lower() == 'nc' and not drv_list and \
drv_list[0].upper() == 'GMT' and drv_list[1].upper() == 'NETCDF':
drv_list = ['NETCDF', 'GMT']
return drv_list
def GetOutputDriverFor(filename):
drv_list = GetOutputDriversFor(filename)
if not drv_list:
ext = GetExtension(filename)
if not ext:
return 'GTiff'
else:
raise Exception("Cannot guess driver for %s" % filename)
elif len(drv_list) > 1:
print("Several drivers matching %s extension. Using %s" % (ext, drv_list[0]))
return drv_list[0]
# =============================================================================
# Mainline
# =============================================================================
color_count = 256
frmt = None
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' or arg == '-f':
i = i + 1
frmt = 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.
if frmt is None:
frmt = GetOutputDriverFor(dst_filename)
dst_driver = gdal.GetDriverByName(frmt)
if dst_driver is None:
print('"%s" driver not registered.' % frmt)
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_nocb)
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_nocb)
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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