2 # -*- coding: utf-8 -*-
5 Implements support for *Canon* colorspaces conversions and transfer functions.
10 import aces_ocio.generate_lut as genlut
11 from aces_ocio.utilities import ColorSpace
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_c_log',
24 def create_c_log(gamut,
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 legal_to_full(codeValue):
58 return (codeValue - 64.0) / (940.0 - 64.0)
60 def c_log_to_linear(codeValue):
61 # log = fullToLegal(c1 * log10(c2*linear + 1) + c3)
62 # linear = (pow(10, (legalToFul(log) - c3)/c1) - 1)/c2
67 linear = (pow(10.0, (legal_to_full(codeValue) - c3) / c1) - 1.0) / c2
69 # print(codeValue, linear)
72 cs.to_reference_transforms = []
74 if transfer_function == "Canon-Log":
75 data = array.array('f', "\0" * lut_resolution_1d * 4)
76 for c in range(lut_resolution_1d):
77 data[c] = c_log_to_linear(1023.0 * c / (lut_resolution_1d - 1))
79 lut = "%s_to_linear.spi1d" % transfer_function
80 genlut.write_SPI_1d(lut_directory + "/" + lut,
87 cs.to_reference_transforms.append({
90 'interpolation': 'linear',
91 'direction': 'forward'})
93 if gamut == 'Rec. 709 Daylight':
94 cs.to_reference_transforms.append({
96 'matrix': [0.561538969, 0.402060105, 0.036400926, 0.0,
97 0.092739623, 0.924121198, -0.016860821, 0.0,
98 0.084812961, 0.006373835, 0.908813204, 0.0,
100 'direction': 'forward'})
101 elif gamut == 'Rec. 709 Tungsten':
102 cs.to_reference_transforms.append({
104 'matrix': [0.566996399, 0.365079418, 0.067924183, 0.0,
105 0.070901044, 0.880331008, 0.048767948, 0.0,
106 0.073013542, -0.066540862, 0.99352732, 0.0,
108 'direction': 'forward'})
109 elif gamut == 'DCI-P3 Daylight':
110 cs.to_reference_transforms.append({
112 'matrix': [0.607160575, 0.299507286, 0.093332140, 0.0,
113 0.004968120, 1.050982224, -0.055950343, 0.0,
114 -0.007839939, 0.000809127, 1.007030813, 0.0,
116 'direction': 'forward'})
117 elif gamut == 'DCI-P3 Tungsten':
118 cs.to_reference_transforms.append({
120 'matrix': [0.650279125, 0.253880169, 0.095840706, 0.0,
121 -0.026137986, 1.017900530, 0.008237456, 0.0,
122 0.007757558, -0.063081669, 1.055324110, 0.0,
124 'direction': 'forward'})
125 elif gamut == 'Cinema Gamut Daylight':
126 cs.to_reference_transforms.append({
128 'matrix': [0.763064455, 0.149021161, 0.087914384, 0.0,
129 0.003657457, 1.10696038, -0.110617837, 0.0,
130 -0.009407794, -0.218383305, 1.227791099, 0.0,
132 'direction': 'forward'})
133 elif gamut == 'Cinema Gamut Tungsten':
134 cs.to_reference_transforms.append({
136 'matrix': [0.817416293, 0.090755698, 0.091828009, 0.0,
137 -0.035361374, 1.065690585, -0.030329211, 0.0,
138 0.010390366, -0.299271107, 1.288880741, 0.0,
140 'direction': 'forward'})
142 cs.from_reference_transforms = []
146 def create_colorspaces(lut_directory, lut_resolution_1d):
148 Generates the colorspace conversions.
153 Parameter description.
158 Return value description.
164 c_log_1 = create_c_log(
170 colorspaces.append(c_log_1)
172 c_log_2 = create_c_log(
178 colorspaces.append(c_log_2)
180 c_log_3 = create_c_log(
186 colorspaces.append(c_log_3)
188 c_log_4 = create_c_log(
194 colorspaces.append(c_log_4)
196 c_log_5 = create_c_log(
197 "Cinema Gamut Daylight",
202 colorspaces.append(c_log_5)
204 c_log_6 = create_c_log(
205 "Cinema Gamut Tungsten",
210 colorspaces.append(c_log_6)
213 c_log_7 = create_c_log(
219 colorspaces.append(c_log_7)
222 c_log_8 = create_c_log(
228 colorspaces.append(c_log_8)
230 c_log_9 = create_c_log(
236 colorspaces.append(c_log_9)
238 c_log_10 = create_c_log(
244 colorspaces.append(c_log_10)
246 c_log_11 = create_c_log(
252 colorspaces.append(c_log_11)
254 c_log_12 = create_c_log(
255 "Cinema Gamut Daylight",
260 colorspaces.append(c_log_12)
262 c_log_13 = create_c_log(
263 "Cinema Gamut Tungsten",
268 colorspaces.append(c_log_13)