├── COPYING ├── README.rst ├── cluttool ├── __init__.py └── cluttool.py └── setup.py /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.rst: -------------------------------------------------------------------------------- 1 | cluttool - create and convert 3D/color LUTs 2 | ------------------------------------------- 3 | 4 | This tool is a sort of swiss army knife for color LUTs. Color LUTs concisely 5 | describe linear color transformations that many video monitors and post 6 | production software can understand. There are a relatively small number of 7 | color LUT file formats, such as 3D LUT (3DL), Cube LUT, and Hald CLUT, but no 8 | one LUT format is used by every software and firmware system. This tool may 9 | help you to convert between LUT formats, or generate new ones in the format 10 | that you need. 11 | 12 | Not all LUTs are created equal 13 | ------------------------------ 14 | 15 | This tool is not aware of the context of the color LUT. It doesn't know what 16 | type of source medium it was made for, nor what its goals are. It simply 17 | converts the color transformations verbatim. 18 | 19 | Those film simulation HaldCLUT files aren't going to apply correctly to s-log 20 | footage, and those video style LUT packs aren't going to apply corrrectly to 21 | your 8-bit gamma or 14-bit RAW photos. If you're grabbing color LUTs off the 22 | internet, you should understand what *source* the color LUT was created for, 23 | and what kind of transformation it does. 24 | 25 | When in doubt, just test it. However, some LUT packs are purchased and 26 | non-refundable. My hope is that this tool will help make it easier for you to 27 | freely create your own color LUTs for your own needs. 28 | 29 | Supported color LUT formats: 30 | ----------------------- 31 | 32 | +------------------+--------------------+------------+ 33 | | Source format | Destination format | Supported? | 34 | +==================+====================+============+ 35 | | Hald CLUT (.png) | 3D LUT (.3dl) | Yes | 36 | +------------------+--------------------+------------+ 37 | | Hald CLUT (.png) | Cube LUT (.cube) | Yes | 38 | +------------------+--------------------+------------+ 39 | | 3D LUT (.3dl) | Hald CLUT (.png) | No | 40 | +------------------+--------------------+------------+ 41 | | 3D LUT (.3dl) | Cube LUT (.cube) | No | 42 | +------------------+--------------------+------------+ 43 | | Cube LUT (.cube) | Hald CLUT (.png) | No | 44 | +------------------+--------------------+------------+ 45 | | Cube LUT (.cube) | 3D LUT (.3dl) | No | 46 | +------------------+--------------------+------------+ 47 | 48 | I built the framework to support all possible conversions, but I personally only 49 | needed to convert from Hald CLUT (.png) to cube and 3dl, so that is all I 50 | implemented. The places in the code marked ``raise NotImplementedError()`` 51 | indicate where there is missing logic for the unimplemented conversions. 52 | 53 | Similar Tools 54 | ------------- 55 | 56 | 3DLutConverter is another color LUT converter with similar goals: 57 | 58 | https://github.com/spoilt-exile/3DLutConverter 59 | 60 | However, it only supports...(TODO) 61 | 62 | References: 63 | ----------- 64 | 65 | * Hald CLUT reference: http://www.quelsolaar.com/technology/clut.html 66 | * 3D LUT (3DL) reference: http://download.autodesk.com/us/systemdocs/pdf/lustre_color_management_user_guide.pdf#page=14 67 | * Cube LUT reference: http://wwwimages.adobe.com/www.adobe.com/content/dam/acom/en/products/speedgrade/cc/pdfs/cube-lut-specification-1.0.pdf 68 | -------------------------------------------------------------------------------- /cluttool/__init__.py: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/pwnage101/cluttool/2489df78eb6c4f7eba3ee18dbfcd576c7cd81f35/cluttool/__init__.py -------------------------------------------------------------------------------- /cluttool/cluttool.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | # 3 | # Copyright (C) 2018 Troy Sankey 4 | # This file is released under the GNU GPL, version 3 or a later revision. 5 | # For further details see the COPYING file 6 | # 7 | # References: 8 | # - Hald CLUT reference: http://www.quelsolaar.com/technology/clut.html 9 | # - 3D LUT (3DL) reference: http://download.autodesk.com/us/systemdocs/pdf/lustre_color_management_user_guide.pdf#page=14 10 | 11 | import sys 12 | import numbers 13 | from array import array 14 | from decimal import Decimal 15 | import math 16 | import png 17 | import click 18 | 19 | 20 | def fatal_error(message): 21 | """ 22 | Display an error message and exit. 23 | """ 24 | click.echo(message) 25 | sys.exit(1) 26 | 27 | def is_perfect_six_root(n): 28 | c = int(n**(1/6.)) 29 | return (c**6 == n) or ((c+1)**6 == n) 30 | 31 | def write_png(path, data, width, height, bit_depth): 32 | """ 33 | Create an "identity" PNG file. 34 | """ 35 | writer = png.writer( 36 | width=width, 37 | height=height, 38 | bitdepth=bit_depth, 39 | ) 40 | writer.write_array(path, data) 41 | 42 | 43 | def uniform_intervals(end, samples, floating_point=False): 44 | """ 45 | Make `samples` uniformly distributed numbers from 0 to `end`. 46 | """ 47 | dist = end/float(samples-1) 48 | values = [dist*i for i in range(samples)] 49 | if not floating_point: 50 | values = [int(round(v)) for v in values] 51 | for idx in range(1, samples): 52 | actual_dist = values[idx] - values[idx-1] 53 | error_frac = abs(float(actual_dist)/dist - 1.0) 54 | if error_frac > 0.07: 55 | raise ValueError('input parameters to uniform_intervals would yield a non-uniform distribution.') 56 | return values 57 | 58 | 59 | class Value3D(object): 60 | 61 | def __init__(self, components): 62 | self.components = tuple(components) 63 | 64 | def __str__(self): 65 | return 'Value3D({},{},{})'.format(*self.components) 66 | 67 | def __bytes__(self): 68 | return self.__str__() 69 | 70 | def __repr__(self): 71 | return self.__str__() 72 | 73 | def __iter__(self): 74 | return iter(self.components) 75 | 76 | def __add__(self, y): 77 | return Value3D( 78 | ( 79 | self.components[0] + y.components[0], 80 | self.components[1] + y.components[1], 81 | self.components[2] + y.components[2], 82 | ) 83 | ) 84 | 85 | def __mul__(self, y): 86 | return Value3D( 87 | ( 88 | self.components[0] * y, 89 | self.components[1] * y, 90 | self.components[2] * y, 91 | ) 92 | ) 93 | 94 | def __rmul__(self, x): 95 | return self.__mul__(x) 96 | 97 | 98 | def index_3d(data, size, r_idx, g_idx, b_idx): 99 | """ 100 | Index a flattened 3-channel 3D cubic matrix. 101 | """ 102 | idx = (r_idx) + (size * g_idx) + (size**2 * b_idx) 103 | idx *= 3 104 | # click.echo('index_3d(): size, r_idx, g_idx, b_idx = {},{},{},{}'.format(size, r_idx, g_idx, b_idx)) 105 | # click.echo('index_3d(): idx = {}'.format(idx)) 106 | return data[idx:idx+3] 107 | 108 | 109 | class ColorLUT(object): 110 | """ 111 | """ 112 | def __init__(self, data, sample_count=None, input_domain=None, red_increments_fastest=True): 113 | if not isinstance(data, array) or not isinstance(data[0], numbers.Number): 114 | raise ValueError('data parameter should be a flat list of numbers.') 115 | if not isinstance(sample_count, int): 116 | raise ValueError('sample_count parameter should be of type int.') 117 | if not isinstance(input_domain, numbers.Number): 118 | raise ValueError('input_domain parameter should be a number.') 119 | if isinstance(input_domain, numbers.Integral): 120 | if data.typecode not in 'bBhHiIlL': 121 | raise ValueError('input_domain parameter should have the same type as the data.') 122 | else: 123 | if data.typecode not in 'fd': 124 | raise ValueError('input_domain parameter should have the same type as the data.') 125 | if not len(data) == 3 * (sample_count**3): 126 | raise ValueError('The sample intervals do not appear to match the matrix dimensions.') 127 | self.data = data 128 | self.sample_count = sample_count 129 | self.input_domain = input_domain 130 | self.red_increments_fastest = red_increments_fastest 131 | if data.typecode in 'fd': 132 | self.datatype = numbers.Real 133 | elif data.typecode in 'bBhHiIlL': 134 | self.datatype = numbers.Integral 135 | self.sample_distance = self.input_domain / float(self.sample_count-1) 136 | 137 | def get_color_value_from_index(self, r_idx, g_idx, b_idx): 138 | """ 139 | Determine the output color value given 3D matrix indices. 140 | """ 141 | if not self.red_increments_fastest: 142 | r_idx, b_idx = b_idx, r_idx 143 | color_value = Value3D(index_3d(self.data, self.sample_count, r_idx, g_idx, b_idx)) 144 | # click.echo('get_color_value_from_index(): r_idx,g_idx,b_idx = {},{},{}'.format(r_idx,g_idx,b_idx)) 145 | # click.echo('get_color_value_from_index(): color_value = {}'.format(str(color_value))) 146 | return color_value 147 | 148 | def get_interpolated_color_value(self, r_input, g_input, b_input): 149 | """ 150 | Determine the output color value using trilinear interpolation. 151 | 152 | Algorithm adapted from https://en.wikipedia.org/wiki/Trilinear_interpolation 153 | """ 154 | # On wikipedia, the equations for v_d were: 155 | # 156 | # r_d = ( r - r_0 ) / ( r_1 - r_0 ) 157 | # g_d = ( g - g_0 ) / ( g_1 - g_0 ) 158 | # b_d = ( b - b_0 ) / ( b_1 - b_0 ) 159 | # 160 | # but v-v_0 is equivalent to math.remainder(v, self.sample_distance), 161 | # and v_1-v_0 is equivalent to self.sample_distance, 162 | # therefore, v_d = float(Decimal(v_input) % Decimal(self.sample_distance)) / self.sample_distance. 163 | # 164 | # Furthermore, we need to handle the border case where v_input == the 165 | # maximum possible value (i.e. self.input_domain). 166 | if r_input == self.input_domain: 167 | r_0_idx = self.sample_count - 2 168 | r_d = 1 169 | else: 170 | r_0_idx = math.trunc(r_input/self.sample_distance) 171 | r_d = float(Decimal(r_input) % Decimal(self.sample_distance)) / self.sample_distance 172 | 173 | if g_input == self.input_domain: 174 | g_0_idx = self.sample_count - 2 175 | g_d = 1 176 | else: 177 | g_0_idx = math.trunc(g_input/self.sample_distance) 178 | g_d = float(Decimal(g_input) % Decimal(self.sample_distance)) / self.sample_distance 179 | 180 | if b_input == self.input_domain: 181 | b_0_idx = self.sample_count - 2 182 | b_d = 1 183 | else: 184 | b_0_idx = math.trunc(b_input/self.sample_distance) 185 | b_d = float(Decimal(b_input) % Decimal(self.sample_distance)) / self.sample_distance 186 | 187 | r_1_idx = r_0_idx + 1 188 | g_1_idx = g_0_idx + 1 189 | b_1_idx = b_0_idx + 1 190 | 191 | c_000 = self.get_color_value_from_index(r_0_idx, g_0_idx, b_0_idx) 192 | c_001 = self.get_color_value_from_index(r_0_idx, g_0_idx, b_1_idx) 193 | c_010 = self.get_color_value_from_index(r_0_idx, g_1_idx, b_0_idx) 194 | c_011 = self.get_color_value_from_index(r_0_idx, g_1_idx, b_1_idx) 195 | c_100 = self.get_color_value_from_index(r_1_idx, g_0_idx, b_0_idx) 196 | c_101 = self.get_color_value_from_index(r_1_idx, g_0_idx, b_1_idx) 197 | c_110 = self.get_color_value_from_index(r_1_idx, g_1_idx, b_0_idx) 198 | c_111 = self.get_color_value_from_index(r_1_idx, g_1_idx, b_1_idx) 199 | 200 | c_00 = c_000*(1.0-r_d) + c_100*r_d 201 | c_01 = c_001*(1.0-r_d) + c_101*r_d 202 | c_10 = c_010*(1.0-r_d) + c_110*r_d 203 | c_11 = c_011*(1.0-r_d) + c_111*r_d 204 | 205 | c_0 = c_00*(1.0-g_d) + c_10*g_d 206 | c_1 = c_01*(1.0-g_d) + c_11*g_d 207 | 208 | c = c_0*(1.0-b_d) + c_1*b_d 209 | 210 | return c 211 | 212 | def get_values_translated( 213 | self, 214 | increment_red_fastest=True, 215 | output_sample_count=None, 216 | output_domain=None, 217 | ): 218 | """ 219 | Make an iterable of output color values in sequence. 220 | 221 | If necessary, reorder the output data values in order to make them 222 | correspond to red/blue input channels incrementing most/least rapidly 223 | by default. Switch increment_red_fastest=False for the opposite 224 | behavior 225 | """ 226 | interpolate_output = output_sample_count != self.sample_count 227 | scale_output = output_domain != self.input_domain 228 | 229 | scaling_factor = output_domain / float(self.input_domain) 230 | 231 | if increment_red_fastest: 232 | indexes = ( 233 | (r, g, b) 234 | for b in range(output_sample_count) 235 | for g in range(output_sample_count) 236 | for r in range(output_sample_count) 237 | ) 238 | else: 239 | indexes = ( 240 | (r, g, b) 241 | for r in range(output_sample_count) 242 | for g in range(output_sample_count) 243 | for b in range(output_sample_count) 244 | ) 245 | 246 | if interpolate_output: 247 | input_values = ( 248 | Value3D(idx)*(self.input_domain/float(output_sample_count-1)) 249 | for idx in indexes 250 | ) 251 | output_values = ( 252 | self.get_interpolated_color_value(*input_value) 253 | for input_value in input_values 254 | ) 255 | else: 256 | output_values = ( 257 | self.get_color_value_from_index(*idx) 258 | for idx in indexes 259 | ) 260 | 261 | if scale_output: 262 | output_values = ( 263 | output_value*scaling_factor 264 | for output_value in output_values 265 | ) 266 | 267 | return output_values 268 | 269 | @classmethod 270 | def from_haldclut(cls, src): 271 | src_png = png.Reader(filename=src) 272 | width, height, data, meta = src_png.read_flat() 273 | if 'palette' in meta: 274 | raise ValueError('Then given PNG file uses a color palette. Refusing.') 275 | if 'gamma' in meta: 276 | raise ValueError('Then given PNG file contains a gamma value. Refusing.') 277 | if 'transparent' in meta: 278 | raise ValueError('Then given PNG file specifies a transparent color. Refusing.') 279 | if meta['alpha']: 280 | raise ValueError('Then given PNG file contains an alpha channel. Refusing.') 281 | if meta['greyscale']: 282 | def triple_generator(d): 283 | for val in d: 284 | yield val 285 | yield val 286 | yield val 287 | data = array(data.typecode, triple_generator(data)) 288 | if meta['bitdepth'] not in (8, 16): 289 | raise ValueError('Then given PNG file specifies an unsupported bit depth. Refusing.') 290 | width_is_square_root_of_perfect_six_root = is_perfect_six_root(width**2) 291 | if width != height or not width_is_square_root_of_perfect_six_root: 292 | raise ValueError('The given PNG file does not have appropriate Hald CLUT dimensions. Refusing.') 293 | sample_count = int(round((width**2)**(1./3))) 294 | input_domain = 2**meta['bitdepth']-1 295 | click.echo('from_haldclut(): PNG dimensions = {}x{}'.format(width, height)) 296 | click.echo('from_haldclut(): PNG bit depth = {}'.format(meta['bitdepth'])) 297 | click.echo('from_haldclut(): PNG array typecode = {}'.format(data.typecode)) 298 | click.echo('from_haldclut(): Inferred input domain = {}'.format(input_domain)) 299 | click.echo('from_haldclut(): Inferred 3D matrix dimensions = {0}x{0}x{0}'.format(sample_count)) 300 | return cls(data, sample_count=sample_count, input_domain=input_domain) 301 | 302 | @classmethod 303 | def from_3dl(cls, src): 304 | raise NotImplementedError() 305 | 306 | def write_haldclut(self): 307 | raise NotImplementedError() 308 | 309 | def write_3dl(self, dest): 310 | output_domain = 1023 311 | sample_intervals = uniform_intervals(output_domain, self.sample_count) 312 | color_value_gen = self.get_values_translated( 313 | increment_red_fastest=False, 314 | output_sample_count=self.sample_count, 315 | output_domain=output_domain, 316 | ) 317 | with open(dest, 'w') as destfile: 318 | destfile.write(' '.join(str(v) for v in sample_intervals)) 319 | destfile.write('\n') 320 | for color in color_value_gen: 321 | line = ' '.join('{:.0f}'.format(v) for v in color) 322 | destfile.write(line) 323 | destfile.write('\n') 324 | 325 | def write_cube(self, dest): 326 | output_domain = 1.0 327 | output_sample_count = self.sample_count 328 | color_value_gen = self.get_values_translated( 329 | output_sample_count=output_sample_count, 330 | output_domain=output_domain, 331 | ) 332 | with open(dest, 'w') as destfile: 333 | destfile.write('LUT_3D_SIZE {}'.format(output_sample_count)) 334 | destfile.write('\n') 335 | for color in color_value_gen: 336 | line = ' '.join('{:.7g}'.format(v) for v in color) 337 | destfile.write(line) 338 | destfile.write('\n') 339 | 340 | 341 | @click.command() 342 | @click.argument( 343 | 'src', 344 | type=click.Path(exists=True, dir_okay=False), 345 | ) 346 | @click.argument( 347 | 'dest', 348 | type=click.Path(exists=False), 349 | ) 350 | @click.option( 351 | '--dest-type', 352 | help='Type of color LUT. If this argument is not provided, the output type is inferred from the destination filename extension.', 353 | type=click.Choice(['3dl', 'haldclut', 'cube']), 354 | ) 355 | def cli(src, dest, dest_type): 356 | if not src: 357 | raise ValueError('Please specify a source LUT file.') 358 | if not dest: 359 | raise ValueError('Please specify a destination LUT file.') 360 | if not dest_type: 361 | dest_type = dest.lower().split('.')[-1] 362 | if dest_type == 'png': 363 | dest_type = 'haldclut' 364 | dest_type = dest_type.lower() 365 | src_ext = src.lower().split('.')[-1] 366 | if src_ext == 'png': 367 | clut = ColorLUT.from_haldclut(src) 368 | elif src_ext == '3dl': 369 | clut = ColorLUT.from_3dl(src) 370 | elif src_ext == 'cube': 371 | clut = ColorLUT.from_haldclut(src) 372 | else: 373 | raise ValueError('Not an appropriate Color LUT file type: {}'.format(src_ext)) 374 | if dest_type == 'haldclut': 375 | clut.write_haldclut(dest) 376 | elif dest_type == '3dl': 377 | clut.write_3dl(dest) 378 | elif dest_type == 'cube': 379 | clut.write_cube(dest) 380 | else: 381 | raise ValueError('Not an appropriate Color LUT file type: {}'.format(dest_type)) 382 | 383 | 384 | if __name__ == '__main__': 385 | cli() 386 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | from setuptools import setup 2 | setup( 3 | name="cluttool", 4 | version="wip", # i.e. this version doesn't even work yet. 5 | packages=find_packages(), 6 | entry_points={ 7 | 'gui_scripts': [ 8 | 'cluttool = cluttool:cli', 9 | ] 10 | }, 11 | install_requires=['click>=6.7<8.0'], 12 | install_requires=load_requirements('requirements/base.in'), 13 | author="Troy Sankey", 14 | author_email="sankeytms@gmail.com", 15 | description="create and convert 3D/color LUTs", 16 | license="GPLv3", 17 | keywords="lut hald clut 3dl 3d color", 18 | classifiers=[ 19 | ( 20 | 'License :: OSI Approved' 21 | ':: GNU General Public License v3 or later (GPLv3+)'), 22 | 'Operating System :: POSIX', 23 | 'Programming Language :: Python :: 3.5', 24 | 'Programming Language :: Python :: 3.6', 25 | 'Programming Language :: Python :: 3.7', 26 | 'Programming Language :: Python :: 3 :: Only', 27 | ], 28 | ) 29 | --------------------------------------------------------------------------------