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
19 __author__ = 'ACES Developers'
20 __copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
22 __maintainer__ = 'ACES Developers'
23 __email__ = 'aces@oscars.org'
24 __status__ = 'Production'
26 __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 = []
61 cs.description = 'The %s color space' % name
63 cs.equality_group = name
67 # A linear space needs allocation variables
68 cs.allocation_type = ocio.Constants.ALLOCATION_UNIFORM
69 cs.allocation_vars = [0, 1]
71 cs.to_reference_transforms = []
72 if to_reference_values:
73 for matrix in to_reference_values:
74 cs.to_reference_transforms.append({
76 'matrix': mat44_from_mat33(matrix),
77 'direction': 'forward'})
79 cs.from_reference_transforms = []
80 if from_reference_values:
81 for matrix in from_reference_values:
82 cs.from_reference_transforms.append({
84 'matrix': mat44_from_mat33(matrix),
85 'direction': 'forward'})
90 # -------------------------------------------------------------------------
91 # *Transfer Function Transform*
92 # -------------------------------------------------------------------------
93 def create_transfer_colorspace(name='transfer',
94 transfer_function_name='transfer_function',
95 transfer_function=lambda x: x,
97 lut_resolution_1d=1024,
105 Parameter description.
110 Return value description.
116 cs = ColorSpace(name)
117 cs.description = 'The %s color space' % name
119 cs.equality_group = name
120 cs.family = 'Utility'
123 # A linear space needs allocation variables
124 cs.allocation_type = ocio.Constants.ALLOCATION_UNIFORM
125 cs.allocation_vars = [0, 1]
127 # Sample the transfer function
128 data = array.array('f', '\0' * lut_resolution_1d * 4)
129 for c in range(lut_resolution_1d):
130 data[c] = transfer_function(c / (lut_resolution_1d - 1))
132 # Write the sampled data to a LUT
133 lut = '%s_to_linear.spi1d' % transfer_function_name
135 os.path.join(lut_directory, lut),
142 # Create the 'to_reference' transforms
143 cs.to_reference_transforms = []
144 cs.to_reference_transforms.append({
147 'interpolation': 'linear',
148 'direction': 'forward'})
150 # Create the 'from_reference' transforms
151 cs.from_reference_transforms = []
156 # create_transfer_colorspace
158 # -------------------------------------------------------------------------
159 # *Transfer Function + Matrix Transform*
160 # -------------------------------------------------------------------------
161 def create_matrix_plus_transfer_colorspace(
162 name='matrix_plus_transfer',
163 transfer_function_name='transfer_function',
164 transfer_function=lambda x: x,
165 lut_directory='/tmp',
166 lut_resolution_1d=1024,
167 from_reference_values=None,
168 to_reference_values=None,
176 Parameter description.
181 Return value description.
184 if from_reference_values is None:
185 from_reference_values = []
187 if to_reference_values is None:
188 to_reference_values = []
193 cs = ColorSpace(name)
194 cs.description = 'The %s color space' % name
196 cs.equality_group = name
197 cs.family = 'Utility'
200 # A linear space needs allocation variables
201 cs.allocation_type = ocio.Constants.ALLOCATION_UNIFORM
202 cs.allocation_vars = [0, 1]
204 # Sample the transfer function
205 data = array.array('f', '\0' * lut_resolution_1d * 4)
206 for c in range(lut_resolution_1d):
207 data[c] = transfer_function(c / (lut_resolution_1d - 1))
209 # Write the sampled data to a LUT
210 lut = '%s_to_linear.spi1d' % transfer_function_name
212 os.path.join(lut_directory, lut),
219 # Create the 'to_reference' transforms
220 cs.to_reference_transforms = []
221 if to_reference_values:
222 cs.to_reference_transforms.append({
225 'interpolation': 'linear',
226 'direction': 'forward'})
228 for matrix in to_reference_values:
229 cs.to_reference_transforms.append({
231 'matrix': mat44_from_mat33(matrix),
232 'direction': 'forward'})
234 # Create the 'from_reference' transforms
235 cs.from_reference_transforms = []
236 if from_reference_values:
237 for matrix in from_reference_values:
238 cs.from_reference_transforms.append({
240 'matrix': mat44_from_mat33(matrix),
241 'direction': 'forward'})
243 cs.from_reference_transforms.append({
246 'interpolation': 'linear',
247 'direction': 'inverse'})
252 # create_matrix_plus_transfer_colorspace
254 # Transfer functions for standard color spaces
255 def transfer_function_sRGB_to_linear(v):
263 return pow(((v + (a - 1)) / a), g)
266 def transfer_function_Rec709_to_linear(v):
275 return pow(((v + (a - 1)) / a), g)
278 def transfer_function_Rec2020_10bit_to_linear(v):
287 return pow(((v + (a - 1)) / a), g)
290 def transfer_function_Rec2020_12bit_to_linear(v):
299 return pow(((v + (a - 1)) / a), g)
302 def transfer_function_Rec1886_to_linear(v):
307 # Ignoring legal to full scaling for now
308 # v = (1023.0*v - 64.0)/876.0
310 t = pow(Lw, 1.0 / g) - pow(Lb, 1.0 / g)
312 b = pow(Lb, 1.0 / g) / t
314 return a * pow(max((v + b), 0.0), g)
317 def create_colorspaces(lut_directory,
320 Generates the colorspace conversions.
325 Parameter description.
330 Return value description.
338 cs = create_matrix_colorspace('XYZ-D60',
339 to_reference_values=[aces.ACES_XYZ_TO_AP0],
340 from_reference_values=[aces.ACES_AP0_TO_XYZ],
341 aliases=['lin_xyz_d60'])
342 colorspaces.append(cs)
347 # *ACES* to *Linear*, *P3D60* primaries.
348 XYZ_to_P3D60 = [2.4027414142, -0.8974841639, -0.3880533700,
349 -0.8325796487, 1.7692317536, 0.0237127115,
350 0.0388233815, -0.0824996856, 1.0363685997]
352 cs = create_matrix_colorspace(
354 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_P3D60],
355 aliases=['lin_p3d60'])
356 colorspaces.append(cs)
361 # *ACES* to *Linear*, *P3DCI* primaries.
362 XYZ_to_P3DCI = [2.7253940305, -1.0180030062, -0.4401631952,
363 -0.7951680258, 1.6897320548, 0.0226471906,
364 0.0412418914, -0.0876390192, 1.1009293786]
366 cs = create_matrix_colorspace(
368 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_P3DCI],
369 aliases=['lin_p3dci'])
370 colorspaces.append(cs)
375 # *ACES* to *Linear*, *Rec. 709* primaries.
376 # sRGB and Rec 709 use the same gamut
377 XYZ_to_Rec709 = [3.2409699419, -1.5373831776, -0.4986107603,
378 -0.9692436363, 1.8759675015, 0.0415550574,
379 0.0556300797, -0.2039769589, 1.0569715142]
381 cs = create_matrix_colorspace(
383 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
384 aliases=['lin_srgb'])
385 colorspaces.append(cs)
387 # *Linear* to *sRGB* Transfer Function*
388 cs = create_transfer_colorspace(
391 transfer_function_sRGB_to_linear,
394 aliases=['crv_srgb'])
395 colorspaces.append(cs)
397 # *ACES* to *sRGB* Primaries + Transfer Function*
398 cs = create_matrix_plus_transfer_colorspace(
401 transfer_function_sRGB_to_linear,
404 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
406 colorspaces.append(cs)
411 # *ACES* to *Linear*, *Rec. 709* primaries.
412 XYZ_to_Rec709 = [3.2409699419, -1.5373831776, -0.4986107603,
413 -0.9692436363, 1.8759675015, 0.0415550574,
414 0.0556300797, -0.2039769589, 1.0569715142]
416 cs = create_matrix_colorspace(
418 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
419 aliases=['lin_rec709'])
420 colorspaces.append(cs)
422 # *Linear* to *Rec. 709* Transfer Function*
423 cs = create_transfer_colorspace(
426 transfer_function_Rec709_to_linear,
429 aliases=['crv_rec709'])
430 colorspaces.append(cs)
432 # *ACES* to *Rec. 709* Primaries + Transfer Function*
433 cs = create_matrix_plus_transfer_colorspace(
436 transfer_function_Rec709_to_linear,
439 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
440 aliases=['rec709_camera'])
441 colorspaces.append(cs)
446 # *ACES* to *Linear*, *Rec. 2020* primaries.
447 XYZ_to_Rec2020 = [1.7166511880, -0.3556707838, -0.2533662814,
448 -0.6666843518, 1.6164812366, 0.0157685458,
449 0.0176398574, -0.0427706133, 0.9421031212]
451 cs = create_matrix_colorspace(
453 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec2020],
454 aliases=['lin_rec2020'])
455 colorspaces.append(cs)
457 # *Linear* to *Rec. 2020 10 bit* Transfer Function*
458 cs = create_transfer_colorspace(
461 transfer_function_Rec2020_10bit_to_linear,
464 aliases=['crv_rec2020'])
465 colorspaces.append(cs)
467 # *ACES* to *Rec. 2020 10 bit* Primaries + Transfer Function*
468 cs = create_matrix_plus_transfer_colorspace(
471 transfer_function_Rec2020_10bit_to_linear,
474 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec2020],
475 aliases=['rec2020_camera'])
476 colorspaces.append(cs)
482 # *Linear* to *Rec.1886* Transfer Function*
483 cs = create_transfer_colorspace(
486 transfer_function_Rec1886_to_linear,
489 aliases=['crv_rec1886'])
490 colorspaces.append(cs)
492 # *ACES* to *sRGB* Primaries + Transfer Function*
493 cs = create_matrix_plus_transfer_colorspace(
496 transfer_function_Rec1886_to_linear,
499 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec709],
500 aliases=['rec709_display'])
501 colorspaces.append(cs)
503 # *ACES* to *sRGB* Primaries + Transfer Function*
504 cs = create_matrix_plus_transfer_colorspace(
505 'Rec.2020 - Display',
507 transfer_function_Rec1886_to_linear,
510 from_reference_values=[aces.ACES_AP0_TO_XYZ, XYZ_to_Rec2020],
511 aliases=['rec2020_display'])
512 colorspaces.append(cs)
517 # *ACES* to *Linear*, *Pro Photo* primaries.
518 AP0_to_RIMM = [1.2412367771, -0.1685692287, -0.0726675484,
519 0.0061203066, 1.083151174, -0.0892714806,
520 -0.0032853314, 0.0099796402, 0.9933056912]
522 cs = create_matrix_colorspace(
523 'Linear - RIMM ROMM (ProPhoto)',
524 from_reference_values=[AP0_to_RIMM],
525 aliases=['lin_prophoto', 'lin_rimm'])
526 colorspaces.append(cs)
531 # *ACES* to *Linear*, *Adobe RGB* primaries.
532 AP0_to_ADOBERGB = [1.7245603168, -0.4199935942, -0.3045667227,
533 -0.2764799142, 1.3727190877, -0.0962391734,
534 -0.0261255258, -0.0901747807, 1.1163003065]
536 cs = create_matrix_colorspace(
537 'Linear - Adobe RGB',
538 from_reference_values=[AP0_to_ADOBERGB],
539 aliases=['lin_adobergb'])
540 colorspaces.append(cs)
543 # Adobe Wide Gamut RGB
546 # *ACES* to *Linear*, *Adobe Wide Gamut RGB* primaries.
547 AP0_to_ADOBERGB = [1.3809814778, -0.1158594573, -0.2651220205,
548 0.0057015535, 1.0402949043, -0.0459964578,
549 -0.0038908746, -0.0597091815, 1.0636000561]
551 cs = create_matrix_colorspace(
552 'Linear - Adobe Wide Gamut RGB',
553 from_reference_values=[AP0_to_ADOBERGB],
554 aliases=['lin_adobewidegamutrgb'])
555 colorspaces.append(cs)
561 # *Raw* utility space
563 raw = ColorSpace(name)
564 raw.description = 'The %s color space' % name
565 raw.aliases = ['raw']
566 raw.equality_group = name
567 raw.family = 'Utility'