#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
CIE Chromaticity Diagrams Plotting
==================================
Defines the *CIE* chromaticity diagrams plotting objects:
- :func:`CIE_1931_chromaticity_diagram_plot`
- :func:`CIE_1960_UCS_chromaticity_diagram_plot`
- :func:`CIE_1976_UCS_chromaticity_diagram_plot`
"""
from __future__ import division
import bisect
import os
import matplotlib
import matplotlib.image
import matplotlib.path
import numpy as np
import pylab
from colour.algebra import normalise
from colour.colorimetry import ILLUMINANTS
from colour.models import (
UCS_uv_to_xy,
XYZ_to_UCS,
XYZ_to_xy,
UCS_to_uv,
xy_to_XYZ,
XYZ_to_Luv,
Luv_to_uv,
Luv_uv_to_xy,
XYZ_to_sRGB)
from colour.plotting import (
DEFAULT_FIGURE_WIDTH,
PLOTTING_RESOURCES_DIRECTORY,
canvas,
decorate,
boundaries,
display,
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__ = ['CIE_1931_chromaticity_diagram_colours_plot',
'CIE_1931_chromaticity_diagram_plot',
'CIE_1960_UCS_chromaticity_diagram_colours_plot',
'CIE_1960_UCS_chromaticity_diagram_plot',
'CIE_1976_UCS_chromaticity_diagram_colours_plot',
'CIE_1976_UCS_chromaticity_diagram_plot']
[docs]def CIE_1931_chromaticity_diagram_colours_plot(
surface=1.25,
spacing=0.00075,
cmfs='CIE 1931 2 Degree Standard Observer',
**kwargs):
"""
Plots the *CIE 1931 Chromaticity Diagram* colours.
Parameters
----------
surface : numeric, optional
Generated markers surface.
spacing : numeric, optional
Spacing between markers.
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> CIE_1931_chromaticity_diagram_colours_plot() # doctest: +SKIP
True
"""
settings = {'figure_size': (32, 32)}
settings.update(kwargs)
canvas(**settings)
cmfs = get_cmfs(cmfs)
illuminant = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get('E')
XYZs = [value for key, value in cmfs]
path = matplotlib.path.Path([XYZ_to_xy(x) for x in XYZs])
x_dot, y_dot, colours = [], [], []
for i in np.arange(0, 1, spacing):
for j in np.arange(0, 1, spacing):
if path.contains_path(matplotlib.path.Path([[i, j], [i, j]])):
x_dot.append(i)
y_dot.append(j)
XYZ = xy_to_XYZ((i, j))
RGB = normalise(XYZ_to_sRGB(XYZ, illuminant))
colours.append(RGB)
pylab.scatter(x_dot, y_dot, color=colours, s=surface)
settings.update({
'no_ticks': True,
'bounding_box': [0, 1, 0, 1],
'bbox_inches': 'tight',
'pad_inches': 0})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
[docs]def CIE_1931_chromaticity_diagram_plot(
cmfs='CIE 1931 2 Degree Standard Observer', **kwargs):
"""
Plots the *CIE 1931 Chromaticity Diagram*.
Parameters
----------
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> CIE_1931_chromaticity_diagram_plot() # doctest: +SKIP
True
"""
settings = {'figure_size': (DEFAULT_FIGURE_WIDTH, DEFAULT_FIGURE_WIDTH)}
settings.update(kwargs)
canvas(**settings)
cmfs = get_cmfs(cmfs)
image = matplotlib.image.imread(
os.path.join(PLOTTING_RESOURCES_DIRECTORY,
'CIE_1931_Chromaticity_Diagram_{0}_Large.png'.format(
cmfs.name.replace(' ', '_'))))
pylab.imshow(image, interpolation='nearest', extent=(0, 1, 0, 1))
labels = (
[390, 460, 470, 480, 490, 500, 510, 520, 540, 560, 580, 600, 620, 700])
wavelengths = cmfs.wavelengths
equal_energy = np.array([1 / 3] * 2)
xy = np.array([XYZ_to_xy(XYZ) for XYZ in cmfs.values])
wavelengths_chromaticity_coordinates = dict(tuple(zip(wavelengths, xy)))
pylab.plot(xy[:, 0], xy[:, 1], color='black', linewidth=2)
pylab.plot((xy[-1][0], xy[0][0]),
(xy[-1][1], xy[0][1]),
color='black',
linewidth=2)
for label in labels:
x, y = wavelengths_chromaticity_coordinates.get(label)
pylab.plot(x, y, 'o', color='black', linewidth=2)
index = bisect.bisect(wavelengths, label)
left = wavelengths[index - 1] if index >= 0 else wavelengths[index]
right = (wavelengths[index]
if index < len(wavelengths) else
wavelengths[-1])
dx = (wavelengths_chromaticity_coordinates.get(right)[0] -
wavelengths_chromaticity_coordinates.get(left)[0])
dy = (wavelengths_chromaticity_coordinates.get(right)[1] -
wavelengths_chromaticity_coordinates.get(left)[1])
norme = lambda x: x / np.linalg.norm(x)
xy = np.array([x, y])
direction = np.array((-dy, dx))
normal = (np.array((-dy, dx))
if np.dot(norme(xy - equal_energy),
norme(direction)) > 0 else
np.array((dy, -dx)))
normal = norme(normal)
normal /= 25
pylab.plot([x, x + normal[0] * 0.75],
[y, y + normal[1] * 0.75],
color='black',
linewidth=1.5)
pylab.text(x + normal[0],
y + normal[1],
label,
clip_on=True,
ha='left' if normal[0] >= 0 else 'right',
va='center',
fontdict={'size': 'small'})
settings.update({
'title': 'CIE 1931 Chromaticity Diagram - {0}'.format(cmfs.title),
'x_label': 'CIE x',
'y_label': 'CIE y',
'x_ticker': True,
'y_ticker': True,
'grid': True,
'bounding_box': [-0.1, 0.9, -0.1, 0.9],
'bbox_inches': 'tight',
'pad_inches': 0})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
[docs]def CIE_1960_UCS_chromaticity_diagram_colours_plot(
surface=1.25,
spacing=0.00075,
cmfs='CIE 1931 2 Degree Standard Observer',
**kwargs):
"""
Plots the *CIE 1960 UCS Chromaticity Diagram* colours.
Parameters
----------
surface : numeric, optional
Generated markers surface.
spacing : numeric, optional
Spacing between markers.
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> CIE_1960_UCS_chromaticity_diagram_colours_plot() # doctest: +SKIP
True
"""
settings = {'figure_size': (32, 32)}
settings.update(kwargs)
canvas(**settings)
cmfs = get_cmfs(cmfs)
illuminant = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get('E')
uv = np.array([UCS_to_uv(XYZ_to_UCS(XYZ)) for XYZ in cmfs.values])
path = matplotlib.path.Path(uv)
x_dot, y_dot, colours = [], [], []
for i in np.arange(0, 1, spacing):
for j in np.arange(0, 1, spacing):
if path.contains_path(matplotlib.path.Path([[i, j], [i, j]])):
x_dot.append(i)
y_dot.append(j)
XYZ = xy_to_XYZ(UCS_uv_to_xy((i, j)))
RGB = normalise(XYZ_to_sRGB(XYZ, illuminant))
colours.append(RGB)
pylab.scatter(x_dot, y_dot, color=colours, s=surface)
settings.update({
'no_ticks': True,
'bounding_box': [0, 1, 0, 1],
'bbox_inches': 'tight',
'pad_inches': 0})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
[docs]def CIE_1960_UCS_chromaticity_diagram_plot(
cmfs='CIE 1931 2 Degree Standard Observer', **kwargs):
"""
Plots the *CIE 1960 UCS Chromaticity Diagram*.
Parameters
----------
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> CIE_1960_UCS_chromaticity_diagram_plot() # doctest: +SKIP
True
"""
settings = {'figure_size': (DEFAULT_FIGURE_WIDTH, DEFAULT_FIGURE_WIDTH)}
settings.update(kwargs)
canvas(**settings)
cmfs = get_cmfs(cmfs)
image = matplotlib.image.imread(
os.path.join(PLOTTING_RESOURCES_DIRECTORY,
'CIE_1960_UCS_Chromaticity_Diagram_{0}_Large.png'.format(
cmfs.name.replace(' ', '_'))))
pylab.imshow(image, interpolation='nearest', extent=(0, 1, 0, 1))
labels = [420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530,
540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 680]
wavelengths = cmfs.wavelengths
equal_energy = np.array([1 / 3] * 2)
uv = np.array([UCS_to_uv(XYZ_to_UCS(XYZ)) for XYZ in cmfs.values])
wavelengths_chromaticity_coordinates = dict(tuple(zip(wavelengths, uv)))
pylab.plot(uv[:, 0], uv[:, 1], color='black', linewidth=2)
pylab.plot((uv[-1][0], uv[0][0]),
(uv[-1][1], uv[0][1]),
color='black',
linewidth=2)
for label in labels:
u, v = wavelengths_chromaticity_coordinates.get(label)
pylab.plot(u, v, 'o', color='black', linewidth=2)
index = bisect.bisect(wavelengths, label)
left = wavelengths[index - 1] if index >= 0 else wavelengths[index]
right = (wavelengths[index]
if index < len(wavelengths) else
wavelengths[-1])
dx = (wavelengths_chromaticity_coordinates.get(right)[0] -
wavelengths_chromaticity_coordinates.get(left)[0])
dy = (wavelengths_chromaticity_coordinates.get(right)[1] -
wavelengths_chromaticity_coordinates.get(left)[1])
norme = lambda x: x / np.linalg.norm(x)
uv = np.array([u, v])
direction = np.array((-dy, dx))
normal = (np.array((-dy, dx))
if np.dot(norme(uv - equal_energy),
norme(direction)) > 0 else
np.array((dy, -dx)))
normal = norme(normal)
normal /= 25
pylab.plot([u, u + normal[0] * 0.75],
[v, v + normal[1] * 0.75],
color='black',
linewidth=1.5)
pylab.text(u + normal[0],
v + normal[1],
label,
clip_on=True,
ha='left' if normal[0] >= 0 else 'right',
va='center',
fontdict={'size': 'small'})
settings.update({
'title': 'CIE 1960 UCS Chromaticity Diagram - {0}'.format(cmfs.title),
'x_label': 'CIE u',
'y_label': 'CIE v',
'x_ticker': True,
'y_ticker': True,
'grid': True,
'bounding_box': [-0.075, 0.675, -0.15, 0.6],
'bbox_inches': 'tight',
'pad_inches': 0})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
[docs]def CIE_1976_UCS_chromaticity_diagram_colours_plot(
surface=1.25,
spacing=0.00075,
cmfs='CIE 1931 2 Degree Standard Observer',
**kwargs):
"""
Plots the *CIE 1976 UCS Chromaticity Diagram* colours.
Parameters
----------
surface : numeric, optional
Generated markers surface.
spacing : numeric, optional
Spacing between markers.
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> CIE_1976_UCS_chromaticity_diagram_colours_plot() # doctest: +SKIP
True
"""
settings = {'figure_size': (32, 32)}
settings.update(kwargs)
canvas(**settings)
cmfs = get_cmfs(cmfs)
illuminant = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get('D50')
uv = np.array([Luv_to_uv(XYZ_to_Luv(XYZ, illuminant))
for XYZ in cmfs.values])
path = matplotlib.path.Path(uv)
x_dot, y_dot, colours = [], [], []
for i in np.arange(0, 1, spacing):
for j in np.arange(0, 1, spacing):
if path.contains_path(matplotlib.path.Path([[i, j], [i, j]])):
x_dot.append(i)
y_dot.append(j)
XYZ = xy_to_XYZ(Luv_uv_to_xy((i, j)))
RGB = normalise(XYZ_to_sRGB(XYZ, illuminant))
colours.append(RGB)
pylab.scatter(x_dot, y_dot, color=colours, s=surface)
settings.update({
'no_ticks': True,
'bounding_box': [0, 1, 0, 1],
'bbox_inches': 'tight',
'pad_inches': 0})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
[docs]def CIE_1976_UCS_chromaticity_diagram_plot(
cmfs='CIE 1931 2 Degree Standard Observer', **kwargs):
"""
Plots the *CIE 1976 UCS Chromaticity Diagram*.
Parameters
----------
cmfs : unicode, optional
Standard observer colour matching functions used for diagram bounds.
\*\*kwargs : \*\*
Keywords arguments.
Returns
-------
bool
Definition success.
Examples
--------
>>> CIE_1976_UCS_chromaticity_diagram_plot() # doctest: +SKIP
True
"""
settings = {'figure_size': (DEFAULT_FIGURE_WIDTH, DEFAULT_FIGURE_WIDTH)}
settings.update(kwargs)
canvas(**settings)
cmfs = get_cmfs(cmfs)
image = matplotlib.image.imread(
os.path.join(PLOTTING_RESOURCES_DIRECTORY,
'CIE_1976_UCS_Chromaticity_Diagram_{0}_Large.png'.format(
cmfs.name.replace(' ', '_'))))
pylab.imshow(image, interpolation='nearest', extent=(0, 1, 0, 1))
labels = [420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530,
540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 680]
wavelengths = cmfs.wavelengths
equal_energy = np.array([1 / 3] * 2)
illuminant = ILLUMINANTS.get(
'CIE 1931 2 Degree Standard Observer').get('D50')
uv = np.array([Luv_to_uv(XYZ_to_Luv(XYZ, illuminant))
for XYZ in cmfs.values])
wavelengths_chromaticity_coordinates = dict(zip(wavelengths, uv))
pylab.plot(uv[:, 0], uv[:, 1], color='black', linewidth=2)
pylab.plot((uv[-1][0], uv[0][0]),
(uv[-1][1], uv[0][1]),
color='black',
linewidth=2)
for label in labels:
u, v = wavelengths_chromaticity_coordinates.get(label)
pylab.plot(u, v, 'o', color='black', linewidth=2)
index = bisect.bisect(wavelengths, label)
left = wavelengths[index - 1] if index >= 0 else wavelengths[index]
right = (wavelengths[index]
if index < len(wavelengths) else
wavelengths[-1])
dx = (wavelengths_chromaticity_coordinates.get(right)[0] -
wavelengths_chromaticity_coordinates.get(left)[0])
dy = (wavelengths_chromaticity_coordinates.get(right)[1] -
wavelengths_chromaticity_coordinates.get(left)[1])
norme = lambda x: x / np.linalg.norm(x)
uv = np.array([u, v])
direction = np.array((-dy, dx))
normal = (np.array((-dy, dx))
if np.dot(norme(uv - equal_energy),
norme(direction)) > 0 else
np.array((dy, -dx)))
normal = norme(normal)
normal /= 25
pylab.plot([u, u + normal[0] * 0.75],
[v, v + normal[1] * 0.75],
color='black',
linewidth=1.5)
pylab.text(u + normal[0],
v + normal[1],
label,
clip_on=True,
ha='left' if normal[0] >= 0 else 'right',
va='center',
fontdict={'size': 'small'})
settings.update({
'title': 'CIE 1976 UCS Chromaticity Diagram - {0}'.format(cmfs.title),
'x_label': 'CIE u\'',
'y_label': 'CIE v\'',
'x_ticker': True,
'y_ticker': True,
'grid': True,
'bounding_box': [-0.1, .7, -.1, .7],
'bbox_inches': 'tight',
'pad_inches': 0})
settings.update(kwargs)
boundaries(**settings)
decorate(**settings)
return display(**settings)
Colour 0.3