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canon.py
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canon.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Implements support for *Canon* colorspaces conversions and transfer functions.
"""
from __future__ import division
import array
import os
import PyOpenColorIO as ocio
import aces_ocio.generate_lut as genlut
from aces_ocio.utilities import ColorSpace
__author__ = 'ACES Developers'
__copyright__ = 'Copyright (C) 2014 - 2015 - ACES Developers'
__license__ = ''
__maintainer__ = 'ACES Developers'
__email__ = 'aces@oscars.org'
__status__ = 'Production'
__all__ = ['create_c_log',
'create_colorspaces']
def create_c_log(gamut,
transfer_function,
lut_directory,
lut_resolution_1d,
aliases):
"""
Object description.
Canon-Log to ACES.
Parameters
----------
parameter : type
Parameter description.
Returns
-------
type
Return value description.
"""
name = '%s - %s' % (transfer_function, gamut)
if transfer_function == '':
name = 'Linear - Canon %s' % gamut
if gamut == '':
name = 'Curve - %s' % transfer_function
cs = ColorSpace(name)
cs.description = name
cs.aliases = aliases
cs.equality_group = ''
cs.family = 'Input/Canon'
cs.is_data = False
# A linear space needs allocation variables.
if transfer_function == '':
cs.allocation_type = ocio.Constants.ALLOCATION_LG2
cs.allocation_vars = [-8, 5, 0.00390625]
def legal_to_full(code_value):
return (code_value - 64) / (940 - 64)
def c_log_to_linear(code_value):
# log = fullToLegal(c1 * log10(c2*linear + 1) + c3)
# linear = (pow(10, (legalToFul(log) - c3)/c1) - 1)/c2
c1 = 0.529136
c2 = 10.1596
c3 = 0.0730597
linear = (pow(10, (legal_to_full(code_value) - c3) / c1) - 1) / c2
linear *= 0.9
return linear
cs.to_reference_transforms = []
if transfer_function == 'Canon-Log':
data = array.array('f', '\0' * lut_resolution_1d * 4)
for c in range(lut_resolution_1d):
data[c] = c_log_to_linear(1023 * c / (lut_resolution_1d - 1))
lut = '%s_to_linear.spi1d' % transfer_function
genlut.write_SPI_1d(
os.path.join(lut_directory, lut),
0,
1,
data,
lut_resolution_1d,
1)
cs.to_reference_transforms.append({
'type': 'lutFile',
'path': lut,
'interpolation': 'linear',
'direction': 'forward'})
if gamut == 'Rec. 709 Daylight':
cs.to_reference_transforms.append({
'type': 'matrix',
'matrix': [0.561538969, 0.402060105, 0.036400926, 0,
0.092739623, 0.924121198, -0.016860821, 0,
0.084812961, 0.006373835, 0.908813204, 0,
0, 0, 0, 1],
'direction': 'forward'})
elif gamut == 'Rec. 709 Tungsten':
cs.to_reference_transforms.append({
'type': 'matrix',
'matrix': [0.566996399, 0.365079418, 0.067924183, 0,
0.070901044, 0.880331008, 0.048767948, 0,
0.073013542, -0.066540862, 0.99352732, 0,
0, 0, 0, 1],
'direction': 'forward'})
elif gamut == 'DCI-P3 Daylight':
cs.to_reference_transforms.append({
'type': 'matrix',
'matrix': [0.607160575, 0.299507286, 0.093332140, 0,
0.004968120, 1.050982224, -0.055950343, 0,
-0.007839939, 0.000809127, 1.007030813, 0,
0, 0, 0, 1],
'direction': 'forward'})
elif gamut == 'DCI-P3 Tungsten':
cs.to_reference_transforms.append({
'type': 'matrix',
'matrix': [0.650279125, 0.253880169, 0.095840706, 0,
-0.026137986, 1.017900530, 0.008237456, 0,
0.007757558, -0.063081669, 1.055324110, 0,
0, 0, 0, 1],
'direction': 'forward'})
elif gamut == 'Cinema Gamut Daylight':
cs.to_reference_transforms.append({
'type': 'matrix',
'matrix': [0.763064455, 0.149021161, 0.087914384, 0,
0.003657457, 1.10696038, -0.110617837, 0,
-0.009407794, -0.218383305, 1.227791099, 0,
0, 0, 0, 1],
'direction': 'forward'})
elif gamut == 'Cinema Gamut Tungsten':
cs.to_reference_transforms.append({
'type': 'matrix',
'matrix': [0.817416293, 0.090755698, 0.091828009, 0,
-0.035361374, 1.065690585, -0.030329211, 0,
0.010390366, -0.299271107, 1.288880741, 0,
0, 0, 0, 1],
'direction': 'forward'})
cs.from_reference_transforms = []
return cs
def create_colorspaces(lut_directory, lut_resolution_1d):
"""
Generates the colorspace conversions.
Parameters
----------
parameter : type
Parameter description.
Returns
-------
type
Return value description.
"""
colorspaces = []
# Full conversion
c_log_1 = create_c_log(
'Rec. 709 Daylight',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['canonlog_rec709day'])
colorspaces.append(c_log_1)
c_log_2 = create_c_log(
'Rec. 709 Tungsten',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['canonlog_rec709tung'])
colorspaces.append(c_log_2)
c_log_3 = create_c_log(
'DCI-P3 Daylight',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['canonlog_dcip3day'])
colorspaces.append(c_log_3)
c_log_4 = create_c_log(
'DCI-P3 Tungsten',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['canonlog_dcip3tung'])
colorspaces.append(c_log_4)
c_log_5 = create_c_log(
'Cinema Gamut Daylight',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['canonlog_cgamutday'])
colorspaces.append(c_log_5)
c_log_6 = create_c_log(
'Cinema Gamut Tungsten',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['canonlog_cgamuttung'])
colorspaces.append(c_log_6)
# Linearization Only
c_log_7 = create_c_log(
'',
'Canon-Log',
lut_directory,
lut_resolution_1d,
['crv_canonlog'])
colorspaces.append(c_log_7)
# Primaries Only
c_log_8 = create_c_log(
'Rec. 709 Daylight',
'',
lut_directory,
lut_resolution_1d,
['lin_canonrec709day'])
colorspaces.append(c_log_8)
c_log_9 = create_c_log(
'Rec. 709 Tungsten',
'',
lut_directory,
lut_resolution_1d,
['lin_canonrec709tung'])
colorspaces.append(c_log_9)
c_log_10 = create_c_log(
'DCI-P3 Daylight',
'',
lut_directory,
lut_resolution_1d,
['lin_canondcip3day'])
colorspaces.append(c_log_10)
c_log_11 = create_c_log(
'DCI-P3 Tungsten',
'',
lut_directory,
lut_resolution_1d,
['lin_canondcip3tung'])
colorspaces.append(c_log_11)
c_log_12 = create_c_log(
'Cinema Gamut Daylight',
'',
lut_directory,
lut_resolution_1d,
['lin_canoncgamutday'])
colorspaces.append(c_log_12)
c_log_13 = create_c_log(
'Cinema Gamut Tungsten',
'',
lut_directory,
lut_resolution_1d,
['lin_canoncgamuttung'])
colorspaces.append(c_log_13)
return colorspaces