2 # -*- coding: utf-8 -*-
5 Implements support for general colorspaces conversions and transfer functions.
8 from __future__ import division
13 import PyOpenColorIO as ocio
15 import aces_ocio.generate_lut as genlut
16 from aces_ocio.colorspaces import aces
17 from aces_ocio.utilities import ColorSpace, mat44_from_mat33
20 __author__ = 'ACES Developers'
21 __copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
23 __maintainer__ = 'ACES Developers'
24 __email__ = 'aces@oscars.org'
25 __status__ = 'Production'
27 __all__ = ['create_matrix_colorspace',
30 # -------------------------------------------------------------------------
32 # -------------------------------------------------------------------------
33 def create_matrix_colorspace(name='matrix',
34 from_reference_values=None,
35 to_reference_values=None,
43 Parameter description.
48 Return value description.
51 if from_reference_values is None:
52 from_reference_values = []
54 if to_reference_values is None:
55 to_reference_values = []
58 cs.description = 'The %s color space' % name
60 cs.equality_group = name
64 # A linear space needs allocation variables
65 cs.allocation_type = ocio.Constants.ALLOCATION_UNIFORM
66 cs.allocation_vars = [0, 1]
68 cs.to_reference_transforms = []
69 if to_reference_values:
70 for matrix in to_reference_values:
71 cs.to_reference_transforms.append({
73 'matrix': mat44_from_mat33(matrix),
74 'direction': 'forward'})
76 cs.from_reference_transforms = []
77 if from_reference_values:
78 for matrix in from_reference_values:
79 cs.from_reference_transforms.append({
81 'matrix': mat44_from_mat33(matrix),
82 'direction': 'forward'})
86 # -------------------------------------------------------------------------
87 # *Transfer Function Transform*
88 # -------------------------------------------------------------------------
89 def create_transfer_colorspace(name='transfer',
90 transfer_function_name='transfer_function',
91 transfer_function=lambda x: x,
93 lut_resolution_1d=1024,
101 Parameter description.
106 Return value description.
109 cs = ColorSpace(name)
110 cs.description = 'The %s color space' % name
112 cs.equality_group = name
113 cs.family = 'Utility'
116 # A linear space needs allocation variables
117 cs.allocation_type = ocio.Constants.ALLOCATION_UNIFORM
118 cs.allocation_vars = [0, 1]
120 # Sample the transfer function
121 data = array.array('f', '\0' * lut_resolution_1d * 4)
122 for c in range(lut_resolution_1d):
123 data[c] = transfer_function(c / (lut_resolution_1d - 1))
125 # Write the sampled data to a LUT
126 lut = '%s_to_linear.spi1d' % transfer_function_name
128 os.path.join(lut_directory, lut),
135 # Create the 'to_reference' transforms
136 cs.to_reference_transforms = []
137 cs.to_reference_transforms.append({
140 'interpolation': 'linear',
141 'direction': 'forward'})
143 # Create the 'from_reference' transforms
144 cs.from_reference_transforms = []
147 # create_transfer_colorspace
149 # -------------------------------------------------------------------------
150 # *Transfer Function + Matrix Transform*
151 # -------------------------------------------------------------------------
152 def create_matrix_plus_transfer_colorspace(name='matrix_plus_transfer',
153 transfer_function_name='transfer_function',
154 transfer_function=lambda x: x,
155 lut_directory='/tmp',
156 lut_resolution_1d=1024,
157 from_reference_values=None,
158 to_reference_values=None,
166 Parameter description.
171 Return value description.
174 if from_reference_values is None:
175 from_reference_values = []
177 if to_reference_values is None:
178 to_reference_values = []
180 cs = ColorSpace(name)
181 cs.description = 'The %s color space' % name
183 cs.equality_group = name
184 cs.family = 'Utility'
187 # A linear space needs allocation variables
188 cs.allocation_type = ocio.Constants.ALLOCATION_UNIFORM
189 cs.allocation_vars = [0, 1]
191 # Sample the transfer function
192 data = array.array('f', '\0' * lut_resolution_1d * 4)
193 for c in range(lut_resolution_1d):
194 data[c] = transfer_function(c / (lut_resolution_1d - 1))
196 # Write the sampled data to a LUT
197 lut = '%s_to_linear.spi1d' % transfer_function_name
199 os.path.join(lut_directory, lut),
206 # Create the 'to_reference' transforms
207 cs.to_reference_transforms = []
208 if to_reference_values:
209 cs.to_reference_transforms.append({
212 'interpolation': 'linear',
213 'direction': 'forward'})
215 for matrix in to_reference_values:
216 cs.to_reference_transforms.append({
218 'matrix': mat44_from_mat33(matrix),
219 'direction': 'forward'})
221 # Create the 'from_reference' transforms
222 cs.from_reference_transforms = []
223 if from_reference_values:
224 for matrix in from_reference_values:
225 cs.from_reference_transforms.append({
227 'matrix': mat44_from_mat33(matrix),
228 'direction': 'forward'})
230 cs.from_reference_transforms.append({
233 'interpolation': 'linear',
234 'direction': 'inverse'})
237 # create_matrix_plus_transfer_colorspace
239 # Transfer functions for standard color spaces
240 def transfer_function_sRGB_to_linear(v):
248 return pow(((v + (a - 1)) / a), g)
250 def transfer_function_Rec709_to_linear(v):
259 return pow(((v + (a - 1)) / a), g)
261 def transfer_function_Rec2020_10bit_to_linear(v):
270 return pow(((v + (a - 1)) / a), g)
272 def transfer_function_Rec2020_12bit_to_linear(v):
281 return pow(((v + (a - 1)) / a), g)
283 def transfer_function_Rec1886_to_linear(v):
288 # Ignoring legal to full scaling for now
289 #v = (1023.0*v - 64.0)/876.0
291 t = pow(Lw, 1.0/g) - pow(Lb, 1.0/g)
295 return a*pow(max((v + b), 0.0), g)
297 def create_colorspaces(lut_directory,
301 Generates the colorspace conversions.
306 Parameter description.
311 Return value description.
319 cs = create_matrix_colorspace('XYZ',
320 to_reference_values=[aces.ACES_XYZ_TO_AP0],
321 from_reference_values=[aces.ACES_AP0_TO_XYZ],
323 colorspaces.append(cs)
328 cs = create_matrix_colorspace(
330 to_reference_values=[aces.ACES_AP1_TO_AP0],
331 from_reference_values=[aces.ACES_AP0_TO_AP1],
333 colorspaces.append(cs)
338 # *ACES* to *Linear*, *P3D60* primaries.
339 XYZ_to_P3D60 = [2.4027414142, -0.8974841639, -0.3880533700,
340 -0.8325796487, 1.7692317536, 0.0237127115,
341 0.0388233815, -0.0824996856, 1.0363685997]
343 cs = create_matrix_colorspace(
345 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_P3D60],
346 aliases=["lin_p3d60"])
347 colorspaces.append(cs)
352 # *ACES* to *Linear*, *P3DCI* primaries.
353 XYZ_to_P3DCI = [2.7253940305, -1.0180030062, -0.4401631952,
354 -0.7951680258, 1.6897320548, 0.0226471906,
355 0.0412418914, -0.0876390192, 1.1009293786]
357 cs = create_matrix_colorspace(
359 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_P3DCI],
360 aliases=["lin_p3dci"])
361 colorspaces.append(cs)
366 # *ACES* to *Linear*, *Rec. 709* primaries.
367 XYZ_to_Rec709 = [3.2409699419, -1.5373831776, -0.4986107603,
368 -0.9692436363, 1.8759675015, 0.0415550574,
369 0.0556300797, -0.2039769589, 1.0569715142]
371 cs = create_matrix_colorspace(
373 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
374 aliases=["lin_rec709"])
375 colorspaces.append(cs)
377 # *Linear* to *Rec. 709* Transfer Function*
378 cs = create_transfer_colorspace(
381 transfer_function_Rec709_to_linear,
384 aliases=["crv_rec709"])
385 colorspaces.append(cs)
387 # *ACES* to *Rec. 709* Primaries + Transfer Function*
388 cs = create_matrix_plus_transfer_colorspace(
391 transfer_function_Rec709_to_linear,
394 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
396 colorspaces.append(cs)
401 # *ACES* to *Linear*, *Rec. 709* primaries.
402 # sRGB and Rec 709 use the same gamut
403 XYZ_to_Rec709 = [3.2409699419, -1.5373831776, -0.4986107603,
404 -0.9692436363, 1.8759675015, 0.0415550574,
405 0.0556300797, -0.2039769589, 1.0569715142]
407 cs = create_matrix_colorspace(
409 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
410 aliases=["lin_srgb"])
411 colorspaces.append(cs)
413 # *Linear* to *sRGB* Transfer Function*
414 cs = create_transfer_colorspace(
417 transfer_function_sRGB_to_linear,
420 aliases=["crv_srgb"])
421 colorspaces.append(cs)
423 # *ACES* to *sRGB* Primaries + Transfer Function*
424 cs = create_matrix_plus_transfer_colorspace(
427 transfer_function_sRGB_to_linear,
430 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
432 colorspaces.append(cs)
437 # *ACES* to *Linear*, *Rec. 709* primaries.
438 # Rec 1886 and Rec 709 use the same gamut
439 XYZ_to_Rec709 = [3.2409699419, -1.5373831776, -0.4986107603,
440 -0.9692436363, 1.8759675015, 0.0415550574,
441 0.0556300797, -0.2039769589, 1.0569715142]
443 cs = create_matrix_colorspace(
445 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
446 aliases=["lin_rec1886"])
447 colorspaces.append(cs)
449 # *Linear* to *sRGB* Transfer Function*
450 cs = create_transfer_colorspace(
453 transfer_function_Rec1886_to_linear,
456 aliases=["crv_rec1886"])
457 colorspaces.append(cs)
459 # *ACES* to *sRGB* Primaries + Transfer Function*
460 cs = create_matrix_plus_transfer_colorspace(
463 transfer_function_Rec1886_to_linear,
466 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
468 colorspaces.append(cs)
473 # *ACES* to *Linear*, *Rec. 2020* primaries.
474 XYZ_to_Rec2020 = [1.7166511880, -0.3556707838, -0.2533662814,
475 -0.6666843518, 1.6164812366, 0.0157685458,
476 0.0176398574, -0.0427706133, 0.9421031212]
478 cs = create_matrix_colorspace(
480 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec2020],
481 aliases=["lin_rec2020"])
482 colorspaces.append(cs)
484 # *Linear* to *Rec. 2020 10 bit* Transfer Function*
485 cs = create_transfer_colorspace(
488 transfer_function_Rec2020_10bit_to_linear,
491 aliases=["crv_rec2020"])
492 colorspaces.append(cs)
494 # *ACES* to *Rec. 2020 10 bit* Primaries + Transfer Function*
495 cs = create_matrix_plus_transfer_colorspace(
498 transfer_function_Rec2020_10bit_to_linear,
501 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec2020],
503 colorspaces.append(cs)
508 # *ACES* to *Linear*, *Pro Photo* primaries.
509 AP0_to_RIMM = [1.2412367771, -0.1685692287, -0.0726675484,
510 0.0061203066, 1.083151174, -0.0892714806,
511 -0.0032853314, 0.0099796402, 0.9933056912]
513 cs = create_matrix_colorspace(
514 'Linear - RIMM ROMM (ProPhoto)',
515 from_reference_values=[AP0_to_RIMM],
516 aliases=["lin_prophoto", "lin_rimm"])
517 colorspaces.append(cs)
522 # *ACES* to *Linear*, *Adobe RGB* primaries.
523 AP0_to_ADOBERGB = [1.7245603168, -0.4199935942, -0.3045667227,
524 -0.2764799142, 1.3727190877, -0.0962391734,
525 -0.0261255258, -0.0901747807, 1.1163003065]
527 cs = create_matrix_colorspace(
528 'Linear - Adobe RGB',
529 from_reference_values=[AP0_to_ADOBERGB],
530 aliases=["lin_adobergb"])
531 colorspaces.append(cs)
534 # Adobe Wide Gamut RGB
537 # *ACES* to *Linear*, *Adobe Wide Gamut RGB* primaries.
538 AP0_to_ADOBERGB = [1.3809814778, -0.1158594573, -0.2651220205,
539 0.0057015535, 1.0402949043, -0.0459964578,
540 -0.0038908746, -0.0597091815, 1.0636000561]
542 cs = create_matrix_colorspace(
543 'Linear - Adobe Wide Gamut RGB',
544 from_reference_values=[AP0_to_ADOBERGB],
545 aliases=["lin_adobewidegamutrgb"])
546 colorspaces.append(cs)
552 # *Raw* utility space
554 raw = ColorSpace(name)
555 raw.description = 'The %s color space' % name
557 raw.equality_group = name
558 raw.family = 'Utility'