2 # -*- coding: utf-8 -*-
5 Implements support for *Canon* colorspaces conversions and transfer functions.
11 import aces_ocio.generate_lut as genlut
12 from aces_ocio.utilities import ColorSpace
14 __author__ = 'ACES Developers'
15 __copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
17 __maintainer__ = 'ACES Developers'
18 __email__ = 'aces@oscars.org'
19 __status__ = 'Production'
21 __all__ = ['create_c_log',
25 def create_c_log(gamut,
38 Parameter description.
43 Return value description.
46 name = '%s - %s' % (transfer_function, gamut)
47 if transfer_function == '':
48 name = 'Linear - %s' % gamut
50 name = '%s' % transfer_function
54 cs.equality_group = ''
58 def legal_to_full(codeValue):
59 return (codeValue - 64.0) / (940.0 - 64.0)
61 def c_log_to_linear(codeValue):
62 # log = fullToLegal(c1 * log10(c2*linear + 1) + c3)
63 # linear = (pow(10, (legalToFul(log) - c3)/c1) - 1)/c2
68 linear = (pow(10.0, (legal_to_full(codeValue) - c3) / c1) - 1.0) / c2
70 # print(codeValue, linear)
73 cs.to_reference_transforms = []
75 if transfer_function == 'Canon-Log':
76 data = array.array('f', '\0' * lut_resolution_1d * 4)
77 for c in range(lut_resolution_1d):
78 data[c] = c_log_to_linear(1023.0 * c / (lut_resolution_1d - 1))
80 lut = '%s_to_linear.spi1d' % transfer_function
82 os.path.join(lut_directory, lut),
89 cs.to_reference_transforms.append({
92 'interpolation': 'linear',
93 'direction': 'forward'})
95 if gamut == 'Rec. 709 Daylight':
96 cs.to_reference_transforms.append({
98 'matrix': [0.561538969, 0.402060105, 0.036400926, 0.0,
99 0.092739623, 0.924121198, -0.016860821, 0.0,
100 0.084812961, 0.006373835, 0.908813204, 0.0,
102 'direction': 'forward'})
103 elif gamut == 'Rec. 709 Tungsten':
104 cs.to_reference_transforms.append({
106 'matrix': [0.566996399, 0.365079418, 0.067924183, 0.0,
107 0.070901044, 0.880331008, 0.048767948, 0.0,
108 0.073013542, -0.066540862, 0.99352732, 0.0,
110 'direction': 'forward'})
111 elif gamut == 'DCI-P3 Daylight':
112 cs.to_reference_transforms.append({
114 'matrix': [0.607160575, 0.299507286, 0.093332140, 0.0,
115 0.004968120, 1.050982224, -0.055950343, 0.0,
116 -0.007839939, 0.000809127, 1.007030813, 0.0,
118 'direction': 'forward'})
119 elif gamut == 'DCI-P3 Tungsten':
120 cs.to_reference_transforms.append({
122 'matrix': [0.650279125, 0.253880169, 0.095840706, 0.0,
123 -0.026137986, 1.017900530, 0.008237456, 0.0,
124 0.007757558, -0.063081669, 1.055324110, 0.0,
126 'direction': 'forward'})
127 elif gamut == 'Cinema Gamut Daylight':
128 cs.to_reference_transforms.append({
130 'matrix': [0.763064455, 0.149021161, 0.087914384, 0.0,
131 0.003657457, 1.10696038, -0.110617837, 0.0,
132 -0.009407794, -0.218383305, 1.227791099, 0.0,
134 'direction': 'forward'})
135 elif gamut == 'Cinema Gamut Tungsten':
136 cs.to_reference_transforms.append({
138 'matrix': [0.817416293, 0.090755698, 0.091828009, 0.0,
139 -0.035361374, 1.065690585, -0.030329211, 0.0,
140 0.010390366, -0.299271107, 1.288880741, 0.0,
142 'direction': 'forward'})
144 cs.from_reference_transforms = []
148 def create_colorspaces(lut_directory, lut_resolution_1d):
150 Generates the colorspace conversions.
155 Parameter description.
160 Return value description.
166 c_log_1 = create_c_log(
172 colorspaces.append(c_log_1)
174 c_log_2 = create_c_log(
180 colorspaces.append(c_log_2)
182 c_log_3 = create_c_log(
188 colorspaces.append(c_log_3)
190 c_log_4 = create_c_log(
196 colorspaces.append(c_log_4)
198 c_log_5 = create_c_log(
199 'Cinema Gamut Daylight',
204 colorspaces.append(c_log_5)
206 c_log_6 = create_c_log(
207 'Cinema Gamut Tungsten',
212 colorspaces.append(c_log_6)
215 c_log_7 = create_c_log(
221 colorspaces.append(c_log_7)
224 c_log_8 = create_c_log(
230 colorspaces.append(c_log_8)
232 c_log_9 = create_c_log(
238 colorspaces.append(c_log_9)
240 c_log_10 = create_c_log(
246 colorspaces.append(c_log_10)
248 c_log_11 = create_c_log(
254 colorspaces.append(c_log_11)
256 c_log_12 = create_c_log(
257 'Cinema Gamut Daylight',
262 colorspaces.append(c_log_12)
264 c_log_13 = create_c_log(
265 'Cinema Gamut Tungsten',
270 colorspaces.append(c_log_13)