2 # -*- coding: utf-8 -*-
5 Implements support for *RED* colorspaces conversions and transfer functions.
10 import aces_ocio.generate_lut as genlut
11 from aces_ocio.utilities import ColorSpace, mat44_from_mat33
13 __author__ = 'ACES Developers'
14 __copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
16 __maintainer__ = 'ACES Developers'
17 __email__ = 'aces@oscars.org'
18 __status__ = 'Production'
20 __all__ = ['create_RED_log_film',
24 def create_RED_log_film(gamut,
32 RED colorspaces to ACES.
37 Parameter description.
42 Return value description.
45 name = '%s - %s' % (transfer_function, gamut)
46 if transfer_function == '':
47 name = 'Linear - %s' % gamut
49 name = '%s' % transfer_function
53 cs.equality_group = ''
57 def cineon_to_linear(code_value):
61 code_value_to_density = 0.002
63 black_linear = pow(10.0, (black_point - white_point) * (
64 code_value_to_density / n_gamma))
65 code_linear = pow(10.0, (code_value - white_point) * (
66 code_value_to_density / n_gamma))
68 return (code_linear - black_linear) / (1.0 - black_linear)
70 cs.to_reference_transforms = []
72 if transfer_function == 'REDlogFilm':
73 data = array.array('f', '\0' * lut_resolution_1d * 4)
74 for c in range(lut_resolution_1d):
75 data[c] = cineon_to_linear(1023.0 * c / (lut_resolution_1d - 1))
77 lut = 'CineonLog_to_linear.spi1d'
78 genlut.write_SPI_1d(lut_directory + '/' + lut,
85 cs.to_reference_transforms.append({
88 'interpolation': 'linear',
89 'direction': 'forward'})
91 if gamut == 'DRAGONcolor':
92 cs.to_reference_transforms.append({
94 'matrix': mat44_from_mat33([0.532279, 0.376648, 0.091073,
95 0.046344, 0.974513, -0.020860,
96 -0.053976, -0.000320, 1.054267]),
97 'direction': 'forward'})
98 elif gamut == 'DRAGONcolor2':
99 cs.to_reference_transforms.append({
101 'matrix': mat44_from_mat33([0.468452, 0.331484, 0.200064,
102 0.040787, 0.857658, 0.101553,
103 -0.047504, -0.000282, 1.047756]),
104 'direction': 'forward'})
105 elif gamut == 'REDcolor2':
106 cs.to_reference_transforms.append({
108 'matrix': mat44_from_mat33([0.480997, 0.402289, 0.116714,
109 -0.004938, 1.000154, 0.004781,
110 -0.105257, 0.025320, 1.079907]),
111 'direction': 'forward'})
112 elif gamut == 'REDcolor3':
113 cs.to_reference_transforms.append({
115 'matrix': mat44_from_mat33([0.512136, 0.360370, 0.127494,
116 0.070377, 0.903884, 0.025737,
117 -0.020824, 0.017671, 1.003123]),
118 'direction': 'forward'})
119 elif gamut == 'REDcolor4':
120 cs.to_reference_transforms.append({
122 'matrix': mat44_from_mat33([0.474202, 0.333677, 0.192121,
123 0.065164, 0.836932, 0.097901,
124 -0.019281, 0.016362, 1.002889]),
125 'direction': 'forward'})
127 cs.from_reference_transforms = []
131 def create_colorspaces(lut_directory, lut_resolution_1d):
133 Generates the colorspace conversions.
138 Parameter description.
143 Return value description.
149 RED_log_film_dragon = create_RED_log_film(
155 colorspaces.append(RED_log_film_dragon)
157 RED_log_film_dragon2 = create_RED_log_film(
163 colorspaces.append(RED_log_film_dragon2)
165 RED_log_film_color2 = create_RED_log_film(
171 colorspaces.append(RED_log_film_color2)
173 RED_log_film_color3 = create_RED_log_film(
179 colorspaces.append(RED_log_film_color3)
181 RED_log_film_color4 = create_RED_log_film(
187 colorspaces.append(RED_log_film_color4)
190 RED_log_film_dragon = create_RED_log_film(
196 colorspaces.append(RED_log_film_dragon)
199 RED_log_film_dragon = create_RED_log_film(
205 colorspaces.append(RED_log_film_dragon)
207 RED_log_film_dragon2 = create_RED_log_film(
213 colorspaces.append(RED_log_film_dragon2)
215 RED_log_film_color2 = create_RED_log_film(
221 colorspaces.append(RED_log_film_color2)
223 RED_log_film_color3 = create_RED_log_film(
229 colorspaces.append(RED_log_film_color3)
231 RED_log_film_color4 = create_RED_log_film(
237 colorspaces.append(RED_log_film_color4)