[23] | 1 | #!/usr/bin/env python |
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| 2 | #****************************************************************************** |
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| 3 | # $Id: rgb2pct.py 18194 2009-12-06 20:07:45Z rouault $ |
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| 4 | # |
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| 5 | # Name: rgb2pct |
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| 6 | # Project: GDAL Python Interface |
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| 7 | # Purpose: Application for converting an RGB image to a pseudocolored image. |
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| 8 | # Author: Frank Warmerdam, warmerdam@pobox.com |
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| 9 | # |
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| 10 | #****************************************************************************** |
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| 11 | # Copyright (c) 2001, Frank Warmerdam |
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| 12 | # |
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| 13 | # Permission is hereby granted, free of charge, to any person obtaining a |
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| 14 | # copy of this software and associated documentation files (the "Software"), |
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| 15 | # to deal in the Software without restriction, including without limitation |
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| 16 | # the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 17 | # and/or sell copies of the Software, and to permit persons to whom the |
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| 18 | # Software is furnished to do so, subject to the following conditions: |
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| 19 | # |
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| 20 | # The above copyright notice and this permission notice shall be included |
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| 21 | # in all copies or substantial portions of the Software. |
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| 22 | # |
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| 23 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 24 | # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 25 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 26 | # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 27 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 28 | # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 29 | # DEALINGS IN THE SOFTWARE. |
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| 30 | #****************************************************************************** |
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| 31 | |
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| 32 | try: |
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| 33 | from osgeo import gdal |
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| 34 | except ImportError: |
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| 35 | import gdal |
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| 36 | |
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| 37 | import sys |
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| 38 | import os.path |
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| 39 | |
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| 40 | def Usage(): |
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| 41 | print('Usage: rgb2pct.py [-n colors | -pct palette_file] [-of format] source_file dest_file') |
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| 42 | sys.exit(1) |
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| 43 | |
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| 44 | # ============================================================================= |
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| 45 | # Mainline |
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| 46 | # ============================================================================= |
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| 47 | |
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| 48 | color_count = 256 |
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| 49 | format = 'GTiff' |
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| 50 | src_filename = None |
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| 51 | dst_filename = None |
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| 52 | pct_filename = None |
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| 53 | |
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| 54 | gdal.AllRegister() |
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| 55 | argv = gdal.GeneralCmdLineProcessor( sys.argv ) |
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| 56 | if argv is None: |
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| 57 | sys.exit( 0 ) |
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| 58 | |
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| 59 | # Parse command line arguments. |
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| 60 | i = 1 |
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| 61 | while i < len(argv): |
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| 62 | arg = argv[i] |
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| 63 | |
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| 64 | if arg == '-of': |
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| 65 | i = i + 1 |
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| 66 | format = argv[i] |
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| 67 | |
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| 68 | elif arg == '-n': |
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| 69 | i = i + 1 |
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| 70 | color_count = int(argv[i]) |
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| 71 | |
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| 72 | elif arg == '-pct': |
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| 73 | i = i + 1 |
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| 74 | pct_filename = argv[i] |
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| 75 | |
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| 76 | elif src_filename is None: |
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| 77 | src_filename = argv[i] |
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| 78 | |
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| 79 | elif dst_filename is None: |
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| 80 | dst_filename = argv[i] |
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| 81 | |
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| 82 | else: |
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| 83 | Usage() |
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| 84 | |
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| 85 | i = i + 1 |
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| 86 | |
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| 87 | if dst_filename is None: |
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| 88 | Usage() |
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| 89 | |
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| 90 | # Open source file |
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| 91 | |
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| 92 | src_ds = gdal.Open( src_filename ) |
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| 93 | if src_ds is None: |
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| 94 | print('Unable to open ', src_filename) |
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| 95 | sys.exit(1) |
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| 96 | |
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| 97 | if src_ds.RasterCount < 3: |
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| 98 | print('%s has %d band(s), need 3 for inputs red, green and blue.' \ |
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| 99 | % (src_filename, src_ds.RasterCount)) |
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| 100 | sys.exit(1) |
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| 101 | |
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| 102 | # Ensure we recognise the driver. |
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| 103 | |
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| 104 | dst_driver = gdal.GetDriverByName(format) |
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| 105 | if dst_driver is None: |
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| 106 | print('"%s" driver not registered.' % format) |
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| 107 | sys.exit(1) |
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| 108 | |
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| 109 | # Generate palette |
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| 110 | |
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| 111 | ct = gdal.ColorTable() |
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| 112 | if pct_filename is None: |
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| 113 | err = gdal.ComputeMedianCutPCT( src_ds.GetRasterBand(1), |
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| 114 | src_ds.GetRasterBand(2), |
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| 115 | src_ds.GetRasterBand(3), |
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| 116 | color_count, ct, |
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| 117 | callback = gdal.TermProgress, |
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| 118 | callback_data = 'Generate PCT' ) |
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| 119 | else: |
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| 120 | pct_ds = gdal.Open(pct_filename) |
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| 121 | ct = pct_ds.GetRasterBand(1).GetRasterColorTable().Clone() |
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| 122 | |
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| 123 | # Create the working file. We have to use TIFF since there are few formats |
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| 124 | # that allow setting the color table after creation. |
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| 125 | |
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| 126 | if format == 'GTiff': |
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| 127 | tif_filename = dst_filename |
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| 128 | else: |
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| 129 | tif_filename = 'temp.tif' |
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| 130 | |
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| 131 | gtiff_driver = gdal.GetDriverByName( 'GTiff' ) |
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| 132 | |
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| 133 | tif_ds = gtiff_driver.Create( tif_filename, |
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| 134 | src_ds.RasterXSize, src_ds.RasterYSize, 1) |
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| 135 | |
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| 136 | tif_ds.GetRasterBand(1).SetRasterColorTable( ct ) |
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| 137 | |
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| 138 | # ---------------------------------------------------------------------------- |
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| 139 | # We should copy projection information and so forth at this point. |
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| 140 | |
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| 141 | tif_ds.SetProjection( src_ds.GetProjection() ) |
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| 142 | tif_ds.SetGeoTransform( src_ds.GetGeoTransform() ) |
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| 143 | if src_ds.GetGCPCount() > 0: |
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| 144 | tif_ds.SetGCPs( src_ds.GetGCPs(), src_ds.GetGCPProjection() ) |
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| 145 | |
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| 146 | # ---------------------------------------------------------------------------- |
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| 147 | # Actually transfer and dither the data. |
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| 148 | |
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| 149 | err = gdal.DitherRGB2PCT( src_ds.GetRasterBand(1), |
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| 150 | src_ds.GetRasterBand(2), |
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| 151 | src_ds.GetRasterBand(3), |
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| 152 | tif_ds.GetRasterBand(1), |
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| 153 | ct, |
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| 154 | callback = gdal.TermProgress, |
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| 155 | callback_data = 'Generate PCT' ) |
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| 156 | |
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| 157 | tif_ds = None |
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| 158 | |
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| 159 | if tif_filename != dst_filename: |
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| 160 | tif_ds = gdal.Open( tif_filename ) |
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| 161 | dst_driver.CreateCopy( dst_filename, tif_ds ) |
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| 162 | tif_ds = None |
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| 163 | |
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| 164 | gtiff_driver.Delete( tif_filename ) |
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| 165 | |
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