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,
37 RED colorspaces to ACES.
42 Parameter description.
47 Return value description.
53 name = '%s - %s' % (transfer_function, gamut)
54 if transfer_function == '':
55 name = 'Linear - %s' % gamut
57 name = 'Curve - %s' % transfer_function
62 cs.equality_group = ''
63 cs.family = 'Input/RED'
66 # A linear space needs allocation variables
67 if transfer_function == '':
68 cs.allocation_type = ocio.Constants.ALLOCATION_LG2
69 cs.allocation_vars = [-8, 5, 0.00390625]
71 def cineon_to_linear(code_value):
75 code_value_to_density = 0.002
77 black_linear = pow(10, (black_point - white_point) * (
78 code_value_to_density / n_gamma))
79 code_linear = pow(10, (code_value - white_point) * (
80 code_value_to_density / n_gamma))
82 return (code_linear - black_linear) / (1 - black_linear)
84 cs.to_reference_transforms = []
86 if transfer_function == 'REDlogFilm':
87 data = array.array('f', '\0' * lut_resolution_1d * 4)
88 for c in range(lut_resolution_1d):
89 data[c] = cineon_to_linear(1023 * c / (lut_resolution_1d - 1))
91 lut = 'CineonLog_to_linear.spi1d'
93 os.path.join(lut_directory, lut),
100 cs.to_reference_transforms.append({
103 'interpolation': 'linear',
104 'direction': 'forward'})
106 if gamut == 'DRAGONcolor':
107 cs.to_reference_transforms.append({
109 'matrix': mat44_from_mat33([0.532279, 0.376648, 0.091073,
110 0.046344, 0.974513, -0.020860,
111 -0.053976, -0.000320, 1.054267]),
112 'direction': 'forward'})
113 elif gamut == 'DRAGONcolor2':
114 cs.to_reference_transforms.append({
116 'matrix': mat44_from_mat33([0.468452, 0.331484, 0.200064,
117 0.040787, 0.857658, 0.101553,
118 -0.047504, -0.000282, 1.047756]),
119 'direction': 'forward'})
120 elif gamut == 'REDcolor':
121 cs.to_reference_transforms.append({
123 'matrix': mat44_from_mat33([0.451464, 0.388498, 0.160038,
124 0.062716, 0.866790, 0.070491,
125 -0.017541, 0.086921, 0.930590]),
126 'direction': 'forward'})
127 elif gamut == 'REDcolor2':
128 cs.to_reference_transforms.append({
130 'matrix': mat44_from_mat33([0.480997, 0.402289, 0.116714,
131 -0.004938, 1.000154, 0.004781,
132 -0.105257, 0.025320, 1.079907]),
133 'direction': 'forward'})
134 elif gamut == 'REDcolor3':
135 cs.to_reference_transforms.append({
137 'matrix': mat44_from_mat33([0.512136, 0.360370, 0.127494,
138 0.070377, 0.903884, 0.025737,
139 -0.020824, 0.017671, 1.003123]),
140 'direction': 'forward'})
141 elif gamut == 'REDcolor4':
142 cs.to_reference_transforms.append({
144 'matrix': mat44_from_mat33([0.474202, 0.333677, 0.192121,
145 0.065164, 0.836932, 0.097901,
146 -0.019281, 0.016362, 1.002889]),
147 'direction': 'forward'})
149 cs.from_reference_transforms = []
153 def create_colorspaces(lut_directory, lut_resolution_1d):
155 Generates the colorspace conversions.
160 Parameter description.
165 Return value description.
171 red_log_film_dragon = create_red_log_film(
177 colorspaces.append(red_log_film_dragon)
179 red_log_film_dragon2 = create_red_log_film(
185 colorspaces.append(red_log_film_dragon2)
187 red_log_film_color = create_red_log_film(
193 colorspaces.append(red_log_film_color)
195 red_log_film_color2 = create_red_log_film(
201 colorspaces.append(red_log_film_color2)
203 red_log_film_color3 = create_red_log_film(
209 colorspaces.append(red_log_film_color3)
211 red_log_film_color4 = create_red_log_film(
217 colorspaces.append(red_log_film_color4)
220 red_log_film = create_red_log_film(
226 colorspaces.append(red_log_film)
229 red_dragon = create_red_log_film(
235 colorspaces.append(red_dragon)
237 red_dragon2 = create_red_log_film(
243 colorspaces.append(red_dragon2)
245 red_color = create_red_log_film(
251 colorspaces.append(red_color)
253 red_color2 = create_red_log_film(
259 colorspaces.append(red_color2)
261 red_color3 = create_red_log_film(
267 colorspaces.append(red_color3)
269 red_color4 = create_red_log_film(
275 colorspaces.append(red_color4)