Source code for colour.plotting.temperature

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Colour Temperature & Correlated Colour Temperature Plotting
===========================================================

Defines the colour temperature and correlated colour temperature plotting
objects:

-   :func:`planckian_locus_CIE_1931_chromaticity_diagram_plot`
-   :func:`planckian_locus_CIE_1960_UCS_chromaticity_diagram_plot`
"""

from __future__ import division

import numpy as np
import pylab

from colour.colorimetry import (
    CMFS,
    ILLUMINANTS)
from colour.models import (
    UCS_uv_to_xy,
    XYZ_to_UCS,
    UCS_to_uv,
    xy_to_XYZ)
from colour.temperature import CCT_to_uv
from colour.plotting import (
    CIE_1931_chromaticity_diagram_plot,
    CIE_1960_UCS_chromaticity_diagram_plot,
    display)

__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__ = '[email protected]'
__status__ = 'Production'

__all__ = ['planckian_locus_CIE_1931_chromaticity_diagram_plot',
           'planckian_locus_CIE_1960_UCS_chromaticity_diagram_plot']


[docs]def planckian_locus_CIE_1931_chromaticity_diagram_plot( illuminants=None, **kwargs): """ Plots the planckian locus and given illuminants in *CIE 1931 Chromaticity Diagram*. Parameters ---------- illuminants : array_like, optional Factory illuminants to plot. \*\*kwargs : \*\* Keywords arguments. Returns ------- bool Definition success. Raises ------ KeyError If one of the given illuminant is not found in the factory illuminants. Examples -------- >>> ils = ['A', 'B', 'C'] >>> planckian_locus_CIE_1931_chromaticity_diagram_plot(ils) # noqa # doctest: +SKIP True """ if illuminants is None: illuminants = ('A', 'B', 'C') cmfs = CMFS.get('CIE 1931 2 Degree Standard Observer') settings = { 'title': ('{0} Illuminants - Planckian Locus\n' 'CIE 1931 Chromaticity Diagram - ' 'CIE 1931 2 Degree Standard Observer').format( ', '.join(illuminants)) if illuminants else ('Planckian Locus\nCIE 1931 Chromaticity Diagram - ' 'CIE 1931 2 Degree Standard Observer'), 'standalone': False} settings.update(kwargs) if not CIE_1931_chromaticity_diagram_plot(**settings): return start, end = 1667, 100000 xy = np.array([UCS_uv_to_xy(CCT_to_uv(x, 0, cmfs=cmfs)) for x in np.arange(start, end + 250, 250)]) pylab.plot(xy[:, 0], xy[:, 1], color='black', linewidth=2) for i in [1667, 2000, 2500, 3000, 4000, 6000, 10000]: x0, y0 = UCS_uv_to_xy(CCT_to_uv(i, -0.025, cmfs=cmfs)) x1, y1 = UCS_uv_to_xy(CCT_to_uv(i, 0.025, cmfs=cmfs)) pylab.plot([x0, x1], [y0, y1], color='black', linewidth=2) pylab.annotate('{0}K'.format(i), xy=(x0, y0), xytext=(0, -10), textcoords='offset points', size='x-small') for illuminant in illuminants: xy = ILLUMINANTS.get(cmfs.name).get(illuminant) if xy is None: raise KeyError( ('Illuminant "{0}" not found in factory illuminants: ' '"{1}".').format(illuminant, sorted(ILLUMINANTS.get(cmfs.name).keys()))) pylab.plot(xy[0], xy[1], 'o', color='white', linewidth=2) pylab.annotate(illuminant, xy=(xy[0], xy[1]), xytext=(-50, 30), textcoords='offset points', arrowprops=dict(arrowstyle='->', connectionstyle='arc3, rad=-0.2')) settings.update({'standalone': True}) settings.update(kwargs) return display(**settings)
[docs]def planckian_locus_CIE_1960_UCS_chromaticity_diagram_plot( illuminants=None, **kwargs): """ Plots the planckian locus and given illuminants in *CIE 1960 UCS Chromaticity Diagram*. Parameters ---------- illuminants : array_like, optional Factory illuminants to plot. \*\*kwargs : \*\* Keywords arguments. Returns ------- bool Definition success. Raises ------ KeyError If one of the given illuminant is not found in the factory illuminants. Examples -------- >>> ils = ['A', 'C', 'E'] >>> planckian_locus_CIE_1960_UCS_chromaticity_diagram_plot(ils) # noqa # doctest: +SKIP True """ if illuminants is None: illuminants = ('A', 'C', 'E') cmfs = CMFS.get('CIE 1931 2 Degree Standard Observer') settings = { 'title': ('{0} Illuminants - Planckian Locus\n' 'CIE 1960 UCS Chromaticity Diagram - ' 'CIE 1931 2 Degree Standard Observer').format( ', '.join(illuminants)) if illuminants else ('Planckian Locus\nCIE 1960 UCS Chromaticity Diagram - ' 'CIE 1931 2 Degree Standard Observer'), 'standalone': False} settings.update(kwargs) if not CIE_1960_UCS_chromaticity_diagram_plot(**settings): return xy_to_uv = lambda x: UCS_to_uv(XYZ_to_UCS(xy_to_XYZ(x))) start, end = 1667, 100000 uv = np.array([CCT_to_uv(x, 0, cmfs=cmfs) for x in np.arange(start, end + 250, 250)]) pylab.plot(uv[:, 0], uv[:, 1], color='black', linewidth=2) for i in [1667, 2000, 2500, 3000, 4000, 6000, 10000]: u0, v0 = CCT_to_uv(i, -0.05) u1, v1 = CCT_to_uv(i, 0.05) pylab.plot([u0, u1], [v0, v1], color='black', linewidth=2) pylab.annotate('{0}K'.format(i), xy=(u0, v0), xytext=(0, -10), textcoords='offset points', size='x-small') for illuminant in illuminants: uv = xy_to_uv(ILLUMINANTS.get(cmfs.name).get(illuminant)) if uv is None: raise KeyError( ('Illuminant "{0}" not found in factory illuminants: ' '"{1}".').format(illuminant, sorted(ILLUMINANTS.get(cmfs.name).keys()))) pylab.plot(uv[0], uv[1], 'o', color='white', linewidth=2) pylab.annotate(illuminant, xy=(uv[0], uv[1]), xytext=(-50, 30), textcoords='offset points', arrowprops=dict(arrowstyle='->', connectionstyle='arc3, rad=-0.2')) settings.update({'standalone': True}) settings.update(kwargs) return display(**settings)