#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Colour Models Plotting
======================
Defines the colour models plotting objects:
- :func:`colourspaces_CIE_1931_chromaticity_diagram_plot`
- :func:`single_transfer_function_plot`
- :func:`multi_transfer_function_plot`
"""
from __future__ import division
import numpy as np
import pylab
from colour.models import (
POINTER_GAMUT_DATA,
POINTER_GAMUT_ILLUMINANT,
POINTER_GAMUT_BOUNDARIES,
RGB_COLOURSPACES,
LCHab_to_Lab,
Lab_to_XYZ,
XYZ_to_xy)
from colour.plotting import (
CIE_1931_chromaticity_diagram_plot,
DEFAULT_FIGURE_WIDTH,
canvas,
decorate,
boundaries,
display,
colour_cycle,
get_cmfs)
__author__ = 'Colour Developers'
__copyright__ = 'Copyright (C) 2013 - 2014 - Colour Developers'
__license__ = 'New BSD License - http://opensource.org/licenses/BSD-3-Clause'
__maintainer__ = 'Colour Developers'
__email__ = 'colour-science@googlegroups.com'
__status__ = 'Production'
__all__ = ['get_RGB_colourspace',
'colourspaces_CIE_1931_chromaticity_diagram_plot',
'single_transfer_function_plot',
'multi_transfer_function_plot']
[docs]def get_RGB_colourspace(colourspace):
"""
Returns the *RGB* colourspace with given name.
Parameters
----------
colourspace : unicode
*RGB* Colourspace name.
Returns
-------
RGB_Colourspace
*RGB* Colourspace.
Raises
------
KeyError
If the given colourspace is not found in the factory colourspaces.
"""
colourspace, name = RGB_COLOURSPACES.get(colourspace), colourspace
if colourspace is None:
raise KeyError(
('"{0}" colourspace not found in factory colourspaces: '
'"{1}".').format(name, ', '.join(
sorted(RGB_COLOURSPACES.keys()))))
return colourspace
[docs]def colourspaces_CIE_1931_chromaticity_diagram_plot(
colourspaces=None,
cmfs='CIE 1931 2 Degree Standard Observer',
**kwargs):
"""
Plots given colourspaces in *CIE 1931 Chromaticity Diagram*.
Parameters
----------
colourspaces : list, optional
Colourspaces to plot.
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> csps = ['sRGB', 'ACES RGB']
>>> colourspaces_CIE_1931_chromaticity_diagram_plot(csps) # doctest: +SKIP
True
"""
settings = {'figure_size': (DEFAULT_FIGURE_WIDTH, DEFAULT_FIGURE_WIDTH)}
settings.update(kwargs)
canvas(**settings)
if colourspaces is None:
colourspaces = ('sRGB', 'ACES RGB', 'Pointer Gamut')
cmfs, name = get_cmfs(cmfs), cmfs
settings = {
'title': '{0} - {1}'.format(', '.join(colourspaces), name),
'standalone': False}
settings.update(kwargs)
if not CIE_1931_chromaticity_diagram_plot(**settings):
return
x_limit_min, x_limit_max = [-0.1], [0.9]
y_limit_min, y_limit_max = [-0.1], [0.9]
cycle = colour_cycle('rainbow')
for colourspace in colourspaces:
if colourspace == 'Pointer Gamut':
xy = np.array(POINTER_GAMUT_BOUNDARIES)
alpha_p, colour_p = 0.85, '0.95'
pylab.plot(xy[:, 0],
xy[:, 1],
label='Pointer\'s Gamut',
color=colour_p,
alpha=alpha_p,
linewidth=2)
pylab.plot([xy[-1][0],
xy[0][0]],
[xy[-1][1],
xy[0][1]],
color=colour_p,
alpha=alpha_p,
linewidth=2)
xy = []
for LCHab in POINTER_GAMUT_DATA:
XYZ = Lab_to_XYZ(LCHab_to_Lab(LCHab), POINTER_GAMUT_ILLUMINANT)
xy.append(XYZ_to_xy(XYZ, POINTER_GAMUT_ILLUMINANT))
xy = np.array(xy)
pylab.scatter(xy[:, 0],
xy[:, 1],
alpha=alpha_p / 2,
color=colour_p,
marker='+')
else:
colourspace, name = get_RGB_colourspace(
colourspace), colourspace
r, g, b, a = next(cycle)
primaries = colourspace.primaries
whitepoint = colourspace.whitepoint
pylab.plot([whitepoint[0], whitepoint[0]],
[whitepoint[1], whitepoint[1]],
color=(r, g, b),
label=colourspace.name,
linewidth=2)
pylab.plot([whitepoint[0], whitepoint[0]],
[whitepoint[1], whitepoint[1]],
'o',
color=(r, g, b),
linewidth=2)
pylab.plot([primaries[0, 0], primaries[1, 0]],
[primaries[0, 1], primaries[1, 1]],
'o-',
color=(r, g, b),
linewidth=2)
pylab.plot([primaries[1, 0], primaries[2, 0]],
[primaries[1, 1], primaries[2, 1]],
'o-',
color=(r, g, b),
linewidth=2)
pylab.plot([primaries[2, 0], primaries[0, 0]],
[primaries[2, 1], primaries[0, 1]],
'o-',
color=(r, g, b),
linewidth=2)
x_limit_min.append(np.amin(primaries[:, 0]))
y_limit_min.append(np.amin(primaries[:, 1]))
x_limit_max.append(np.amax(primaries[:, 0]))
y_limit_max.append(np.amax(primaries[:, 1]))
settings.update({
'legend': True,
'legend_location': 'upper right',
'x_tighten': True,
'y_tighten': True,
'limits': [min(x_limit_min), max(x_limit_max),
min(y_limit_min), max(y_limit_max)],
'margins': [-0.05, 0.05, -0.05, 0.05],
'standalone': True})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
[docs]def single_transfer_function_plot(colourspace='sRGB', **kwargs):
"""
Plots given colourspace transfer function.
Parameters
----------
colourspace : unicode, optional
*RGB* Colourspace transfer function to plot.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> single_transfer_function_plot() # doctest: +SKIP
True
"""
settings = {'title': '{0} - Transfer Function'.format(colourspace)}
settings.update(kwargs)
return multi_transfer_function_plot([colourspace], **settings)
[docs]def multi_transfer_function_plot(colourspaces=None,
inverse=False, **kwargs):
"""
Plots given colourspaces transfer functions.
Parameters
----------
colourspaces : list, optional
Colourspaces transfer functions to plot.
inverse : bool
Plot inverse transfer functions.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> multi_transfer_function_plot(['sRGB', 'Rec. 709']) # doctest: +SKIP
True
"""
settings = {'figure_size': (DEFAULT_FIGURE_WIDTH, DEFAULT_FIGURE_WIDTH)}
settings.update(kwargs)
canvas(**settings)
if colourspaces is None:
colourspaces = ['sRGB', 'Rec. 709']
samples = np.linspace(0, 1, 1000)
for i, colourspace in enumerate(colourspaces):
colourspace = get_RGB_colourspace(colourspace)
RGBs = np.array([colourspace.inverse_transfer_function(x)
if inverse else
colourspace.transfer_function(x)
for x in samples])
pylab.plot(samples,
RGBs,
label=u'{0}'.format(colourspace.name),
linewidth=2)
settings.update({
'title': '{0} - Transfer Functions'.format(
', '.join(colourspaces)),
'x_tighten': True,
'legend': True,
'legend_location': 'upper left',
'x_ticker': True,
'y_ticker': True,
'grid': True,
'limits': [0, 1, 0, 1],
'aspect': 'equal'})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
Colour 0.3