2 # -*- coding: utf-8 -*-
5 Implements support for *RED* 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.utilities import ColorSpace, mat44_from_mat33
18 __author__ = 'ACES Developers'
19 __copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
21 __maintainer__ = 'ACES Developers'
22 __email__ = 'aces@oscars.org'
23 __status__ = 'Production'
25 __all__ = ['create_RED_log_film',
29 def create_RED_log_film(gamut,
38 RED colorspaces to ACES.
43 Parameter description.
48 Return value description.
54 name = '%s - %s' % (transfer_function, gamut)
55 if transfer_function == '':
56 name = 'Linear - %s' % gamut
58 name = 'Curve - %s' % transfer_function
63 cs.equality_group = ''
64 cs.family = 'Input/RED'
67 # A linear space needs allocation variables
68 if transfer_function == '':
69 cs.allocation_type = ocio.Constants.ALLOCATION_LG2
70 cs.allocation_vars = [-8, 5, 0.00390625]
72 def cineon_to_linear(code_value):
76 code_value_to_density = 0.002
78 black_linear = pow(10, (black_point - white_point) * (
79 code_value_to_density / n_gamma))
80 code_linear = pow(10, (code_value - white_point) * (
81 code_value_to_density / n_gamma))
83 return (code_linear - black_linear) / (1 - black_linear)
85 cs.to_reference_transforms = []
87 if transfer_function == 'REDlogFilm':
88 data = array.array('f', '\0' * lut_resolution_1d * 4)
89 for c in range(lut_resolution_1d):
90 data[c] = cineon_to_linear(1023 * c / (lut_resolution_1d - 1))
92 lut = 'CineonLog_to_linear.spi1d'
94 os.path.join(lut_directory, lut),
101 cs.to_reference_transforms.append({
104 'interpolation': 'linear',
105 'direction': 'forward'})
107 if gamut == 'DRAGONcolor':
108 cs.to_reference_transforms.append({
110 'matrix': mat44_from_mat33([0.532279, 0.376648, 0.091073,
111 0.046344, 0.974513, -0.020860,
112 -0.053976, -0.000320, 1.054267]),
113 'direction': 'forward'})
114 elif gamut == 'DRAGONcolor2':
115 cs.to_reference_transforms.append({
117 'matrix': mat44_from_mat33([0.468452, 0.331484, 0.200064,
118 0.040787, 0.857658, 0.101553,
119 -0.047504, -0.000282, 1.047756]),
120 'direction': 'forward'})
121 elif gamut == 'REDcolor':
122 cs.to_reference_transforms.append({
124 'matrix': mat44_from_mat33([0.451464, 0.388498, 0.160038,
125 0.062716, 0.866790, 0.070491,
126 -0.017541, 0.086921, 0.930590]),
127 'direction': 'forward'})
128 elif gamut == 'REDcolor2':
129 cs.to_reference_transforms.append({
131 'matrix': mat44_from_mat33([0.480997, 0.402289, 0.116714,
132 -0.004938, 1.000154, 0.004781,
133 -0.105257, 0.025320, 1.079907]),
134 'direction': 'forward'})
135 elif gamut == 'REDcolor3':
136 cs.to_reference_transforms.append({
138 'matrix': mat44_from_mat33([0.512136, 0.360370, 0.127494,
139 0.070377, 0.903884, 0.025737,
140 -0.020824, 0.017671, 1.003123]),
141 'direction': 'forward'})
142 elif gamut == 'REDcolor4':
143 cs.to_reference_transforms.append({
145 'matrix': mat44_from_mat33([0.474202, 0.333677, 0.192121,
146 0.065164, 0.836932, 0.097901,
147 -0.019281, 0.016362, 1.002889]),
148 'direction': 'forward'})
150 cs.from_reference_transforms = []
154 def create_colorspaces(lut_directory, lut_resolution_1d):
156 Generates the colorspace conversions.
161 Parameter description.
166 Return value description.
172 RED_log_film_dragon = create_RED_log_film(
179 colorspaces.append(RED_log_film_dragon)
181 RED_log_film_dragon2 = create_RED_log_film(
188 colorspaces.append(RED_log_film_dragon2)
190 RED_log_film_color = create_RED_log_film(
197 colorspaces.append(RED_log_film_color)
199 RED_log_film_color2 = create_RED_log_film(
206 colorspaces.append(RED_log_film_color2)
208 RED_log_film_color3 = create_RED_log_film(
215 colorspaces.append(RED_log_film_color3)
217 RED_log_film_color4 = create_RED_log_film(
224 colorspaces.append(RED_log_film_color4)
227 RED_log_film = create_RED_log_film(
234 colorspaces.append(RED_log_film)
237 RED_dragon = create_RED_log_film(
244 colorspaces.append(RED_dragon)
246 RED_dragon2 = create_RED_log_film(
253 colorspaces.append(RED_dragon2)
255 RED_color = create_RED_log_film(
262 colorspaces.append(RED_color)
264 RED_color2 = create_RED_log_film(
271 colorspaces.append(RED_color2)
273 RED_color3 = create_RED_log_film(
280 colorspaces.append(RED_color3)
282 RED_color4 = create_RED_log_film(
289 colorspaces.append(RED_color4)