+++ /dev/null
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-
-"""
-Implements support for *Panasonic* colorspaces conversions and transfer
-functions.
-"""
-
-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_v_log',
- 'create_colorspaces']
-
-
-def create_v_log(gamut,
- transfer_function,
- lut_directory,
- lut_resolution_1d,
- aliases):
- """
- Creates colorspace covering the conversion from VLog to ACES, with various transfer
- functions and encoding gamuts covered
-
- Parameters
- ----------
- gamut : str
- The name of the encoding gamut to use.
- transfer_function : str
- The name of the transfer function to use
- lut_directory : str or unicode
- The directory to use when generating LUTs
- lut_resolution_1d : int
- The resolution of generated 1D LUTs
- aliases : list of str
- Aliases for this colorspace
-
- Returns
- -------
- ColorSpace
- A ColorSpace container class referencing the LUTs, matrices and identifying
- information for the requested colorspace.
- """
-
- name = '%s - %s' % (transfer_function, gamut)
- if transfer_function == '':
- name = 'Linear - %s' % gamut
- if gamut == '':
- name = 'Curve - %s' % transfer_function
-
- cs = ColorSpace(name)
- cs.description = name
- cs.aliases = aliases
- cs.equality_group = ''
- cs.family = 'Input/Panasonic'
- 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 v_log_to_linear(x):
- cut_inv = 0.181
- b = 0.00873
- c = 0.241514
- d = 0.598206
-
- if x <= cut_inv:
- return (x - 0.125) / 5.6
- else:
- return pow(10, (x - d) / c) - b
-
- cs.to_reference_transforms = []
-
- if transfer_function == 'V-Log':
- data = array.array('f', '\0' * lut_resolution_1d * 4)
- for c in range(lut_resolution_1d):
- data[c] = v_log_to_linear(float(c) / (lut_resolution_1d - 1))
-
- lut = '%s_to_linear.spi1d' % transfer_function
- genlut.write_SPI_1d(
- os.path.join(lut_directory, lut),
- 0.0,
- 1.0,
- data,
- lut_resolution_1d,
- 1)
-
- cs.to_reference_transforms.append({
- 'type': 'lutFile',
- 'path': lut,
- 'interpolation': 'linear',
- 'direction': 'forward'})
-
- if gamut == 'V-Gamut':
- cs.to_reference_transforms.append({
- 'type': 'matrix',
- 'matrix': [0.724382758, 0.166748484, 0.108497411, 0.0,
- 0.021354009, 0.985138372, -0.006319092, 0.0,
- -0.009234278, -0.00104295, 1.010272625, 0.0,
- 0, 0, 0, 1.0],
- 'direction': 'forward'})
-
- cs.from_reference_transforms = []
- return cs
-
-
-def create_colorspaces(lut_directory, lut_resolution_1d):
- """
- Generates the colorspace conversions.
-
- Parameters
- ----------
- lut_directory : str or unicode
- The directory to use when generating LUTs
- lut_resolution_1d : int
- The resolution of generated 1D LUTs
-
- Returns
- -------
- list
- A list of colorspaces for Panasonic cameras and encodings
- """
-
- colorspaces = []
-
- # Full conversion
- v_log_1 = create_v_log(
- 'V-Gamut',
- 'V-Log',
- lut_directory,
- lut_resolution_1d,
- ['vlog_vgamut'])
- colorspaces.append(v_log_1)
-
- # Linearization Only
- v_log_2 = create_v_log(
- '',
- 'V-Log',
- lut_directory,
- lut_resolution_1d,
- ['crv_vlog'])
- colorspaces.append(v_log_2)
-
- # Primaries Only
- v_log_3 = create_v_log(
- 'V-Gamut',
- '',
- lut_directory,
- lut_resolution_1d,
- ['lin_vgamut'])
- colorspaces.append(v_log_3)
-
- return colorspaces