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#!/usr/bin/env python3 # ****************************************************************************** # # 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 # Copyright (c) 2020-2021, Idan Miara # # SPDX-License-Identifier: MIT # ****************************************************************************** import os.path import sys import textwrap from typing import Optional from osgeo import gdal from osgeo_utils.auxiliary.base import PathLikeOrStr from osgeo_utils.auxiliary.color_table import get_color_table from osgeo_utils.auxiliary.gdal_argparse import GDALArgumentParser, GDALScript from osgeo_utils.auxiliary.util import ( GetOutputDriverFor, enable_gdal_exceptions, open_ds, ) @enable_gdal_exceptions def rgb2pct( src_filename: PathLikeOrStr, pct_filename: Optional[PathLikeOrStr] = None, dst_filename: Optional[PathLikeOrStr] = None, color_count: int = 256, driver_name: Optional[str] = None, creation_options: Optional[list] = None, ): # Open source file src_ds = open_ds(src_filename) if src_ds is None: raise Exception(f"Unable to open {src_filename}") if src_ds.RasterCount < 3: raise Exception( f"{src_filename} has {src_ds.RasterCount} band(s), need 3 for inputs red, green and blue." ) # Ensure we recognise the driver. if not driver_name: driver_name = GetOutputDriverFor(dst_filename) dst_driver = gdal.GetDriverByName(driver_name) if dst_driver is None: raise Exception(f'"{driver_name}" driver not registered.') # Generate palette if pct_filename is None: ct = gdal.ColorTable() err = gdal.ComputeMedianCutPCT( src_ds.GetRasterBand(1), src_ds.GetRasterBand(2), src_ds.GetRasterBand(3), color_count, ct, callback=gdal.TermProgress_nocb, ) else: ct = get_color_table(pct_filename) # Create the working file. We have to use TIFF since there are few formats # that allow setting the color table after creation. if driver_name.lower() == "gtiff": tif_filename = dst_filename else: import tempfile tif_filedesc, tif_filename = tempfile.mkstemp(suffix=".tif") gtiff_driver = gdal.GetDriverByName("GTiff") # Convert options to list if isinstance(creation_options, str): creation_options = creation_options.split() if not creation_options: creation_options = [] tif_ds = gtiff_driver.Create( tif_filename, src_ds.RasterXSize, src_ds.RasterYSize, 1, options=creation_options, ) 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, ) if err != gdal.CE_None: raise Exception("DitherRGB2PCT failed") if tif_filename == dst_filename: dst_ds = tif_ds else: dst_ds = dst_driver.CreateCopy(dst_filename or "", tif_ds) tif_ds = None os.close(tif_filedesc) gtiff_driver.Delete(tif_filename) return dst_ds def doit(**kwargs): try: ds = rgb2pct(**kwargs) return ds, 0 except Exception: return None, 1 class RGB2PCT(GDALScript): def __init__(self): super().__init__() self.title = "Convert a 24bit RGB image to 8bit paletted image" self.description = textwrap.dedent( """\ 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.""" ) def get_parser(self, argv) -> GDALArgumentParser: parser = self.parser parser.add_argument( "-of", dest="driver_name", metavar="gdal_format", help="Select the output format. " "if not specified, the format is guessed from the extension. " "Use the short format name.", ) group = parser.add_mutually_exclusive_group() group.add_argument( "-n", dest="color_count", type=int, default=256, metavar="color", choices=tuple(range(2, 257)), help="Select the number of colors in the generated color table. " "Defaults to 256. Must be between 2 and 256.", ) group.add_argument( "-pct", dest="pct_filename", type=str, help="Extract the color table from instead of computing it. " "Can be used to have a consistent color table for multiple files. " "The palette file must be either a raster file in a GDAL supported format with a " "palette or a color file in a supported format (txt, qml, qlr).", ) parser.add_argument( "--creation-option", "--co", dest="creation_options", default=[], action="append", help="GeoTIFF creation options, e.g. COMPRESS=LZW", ) parser.add_argument("src_filename", type=str, help="The input RGB file.") parser.add_argument( "dst_filename", type=str, help="The output pseudo-colored file that will be created.", ) return parser def doit(self, **kwargs): return rgb2pct(**kwargs) def main(argv=sys.argv): return RGB2PCT().main(argv) if __name__ == "__main__": sys.exit(main(sys.argv))