2 # -*- coding: utf-8 -*-
5 Implements support for *Panasonic* colorspaces conversions and transfer
12 import PyOpenColorIO as ocio
14 import aces_ocio.generate_lut as genlut
15 from aces_ocio.utilities import ColorSpace
17 __author__ = 'ACES Developers'
18 __copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
20 __maintainer__ = 'ACES Developers'
21 __email__ = 'aces@oscars.org'
22 __status__ = 'Production'
24 __all__ = ['create_v_log',
28 def create_v_log(gamut,
36 Panasonic V-Log to ACES.
41 Parameter description.
46 Return value description.
49 name = '%s - %s' % (transfer_function, gamut)
50 if transfer_function == '':
51 name = 'Linear - %s' % gamut
53 name = 'Curve - %s' % transfer_function
58 cs.equality_group = ''
59 cs.family = 'Input/Panasonic'
62 # A linear space needs allocation variables
63 if transfer_function == '':
64 cs.allocation_type = ocio.Constants.ALLOCATION_LG2
65 cs.allocation_vars = [-8, 5, 0.00390625]
67 def v_log_to_linear(x):
74 return (x - 0.125) / 5.6
76 return pow(10, (x - d) / c) - b
78 cs.to_reference_transforms = []
80 if transfer_function == 'V-Log':
81 data = array.array('f', '\0' * lut_resolution_1d * 4)
82 for c in range(lut_resolution_1d):
83 data[c] = v_log_to_linear(float(c) / (lut_resolution_1d - 1))
85 lut = '%s_to_linear.spi1d' % transfer_function
87 os.path.join(lut_directory, lut),
94 cs.to_reference_transforms.append({
97 'interpolation': 'linear',
98 'direction': 'forward'})
100 if gamut == 'V-Gamut':
101 cs.to_reference_transforms.append({
103 'matrix': [0.724382758, 0.166748484, 0.108497411, 0.0,
104 0.021354009, 0.985138372, -0.006319092, 0.0,
105 -0.009234278, -0.00104295, 1.010272625, 0.0,
107 'direction': 'forward'})
109 cs.from_reference_transforms = []
113 def create_colorspaces(lut_directory, lut_resolution_1d):
115 Generates the colorspace conversions.
120 Parameter description.
125 Return value description.
131 v_log_1 = create_v_log(
137 colorspaces.append(v_log_1)
140 v_log_2 = create_v_log(
146 colorspaces.append(v_log_2)
149 v_log_3 = create_v_log(
155 colorspaces.append(v_log_3)