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# vim: set et sw=4 sts=4 fileencoding=utf-8:
#
# The colorzero color library
#
# Copyright (c) 2018 Dave Jones <dave@waveform.org.uk>
#
# SPDX-License-Identifier: BSD-3-Clause
"Tests for the colorzero.deltae module"
from __future__ import (
unicode_literals,
print_function,
division,
absolute_import,
)
try:
from math import isclose
except ImportError:
from compat import isclose
# pylint: disable=wrong-import-order,import-error,missing-docstring
from colorzero import Lab, deltae as de
def test_cie1976_known():
# XXX Test values from current implementation; if anyone can point me at
# a source of "known" test values for CIE1976 I'd be most grateful!
# pylint: disable=bad-whitespace
values = [
# color1, color2, delta-e (graphics), delta-e (textiles)
(Lab(50.0000, 2.6772, -79.7751), Lab(50.0000, 0.0000, -82.7485), 4.0011),
(Lab(50.0000, 3.1571, -77.2803), Lab(50.0000, 0.0000, -82.7485), 6.3142),
(Lab(50.0000, 2.8361, -74.0200), Lab(50.0000, 0.0000, -82.7485), 9.1777),
(Lab(50.0000, -1.3802, -84.2814), Lab(50.0000, 0.0000, -82.7485), 2.0627),
(Lab(50.0000, -1.1848, -84.8006), Lab(50.0000, 0.0000, -82.7485), 2.3696),
(Lab(50.0000, -0.9009, -85.5211), Lab(50.0000, 0.0000, -82.7485), 2.9153),
(Lab(50.0000, 0.0000, 0.0000), Lab(50.0000, -1.0000, 2.0000), 2.2361),
(Lab(50.0000, -1.0000, 2.0000), Lab(50.0000, 0.0000, 0.0000), 2.2361),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0009), 4.9800),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0010), 4.9800),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0011), 4.9800),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0012), 4.9800),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0009, -2.4900), 4.9800),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0010, -2.4900), 4.9800),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0011, -2.4900), 4.9800),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 0.0000, -2.5000), 3.5355),
(Lab(50.0000, 2.5000, 0.0000), Lab(73.0000, 25.0000, -18.0000), 36.8680),
(Lab(50.0000, 2.5000, 0.0000), Lab(61.0000, -5.0000, 29.0000), 31.9100),
(Lab(50.0000, 2.5000, 0.0000), Lab(56.0000, -27.0000, -3.0000), 30.2531),
(Lab(50.0000, 2.5000, 0.0000), Lab(58.0000, 24.0000, 15.0000), 27.4089),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.1736, 0.5854), 0.8924),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.2972, 0.0000), 0.7972),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 1.8634, 0.5757), 0.8583),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.2592, 0.3350), 0.8298),
(Lab(60.2574, -34.0099, 36.2677), Lab(60.4626, -34.1751, 39.4387), 3.1819),
(Lab(63.0109, -31.0961, -5.8663), Lab(62.8187, -29.7946, -4.0864), 2.2133),
(Lab(61.2901, 3.7196, -5.3901), Lab(61.4292, 2.2480, -4.9620), 1.5389),
(Lab(35.0831, -44.1164, 3.7933), Lab(35.0232, -40.0716, 1.5901), 4.6063),
(Lab(22.7233, 20.0904, -46.6940), Lab(23.0331, 14.9730, -42.5619), 6.5847),
(Lab(36.4612, 47.8580, 18.3852), Lab(36.2715, 50.5065, 21.2231), 3.8864),
(Lab(90.8027, -2.0831, 1.4410), Lab(91.1528, -1.6435, 0.0447), 1.5051),
(Lab(90.9257, -0.5406, -0.9208), Lab(88.6381, -0.8985, -0.7239), 2.3238),
(Lab( 6.7747, -0.2908, -2.4247), Lab( 5.8714, -0.0985, -2.2286), 0.9441),
(Lab( 2.0776, 0.0795, -1.1350), Lab( 0.9033, -0.0636, -0.5514), 1.3191),
]
for color1, color2, diff in values:
assert isclose(de.cie1976(color1, color2), diff, abs_tol=1e-4)
def test_cie1994_known():
# XXX Test values from current implementation; if anyone can point me at
# a source of "known" test values for CIE1994 I'd be most grateful!
# pylint: disable=bad-whitespace
values = [
# color1, color2, delta-e (graphics), delta-e (textiles)
(Lab(50.0000, 2.6772, -79.7751), Lab(50.0000, 0.0000, -82.7485), 1.3950, 1.4230),
(Lab(50.0000, 3.1571, -77.2803), Lab(50.0000, 0.0000, -82.7485), 1.9341, 1.9427),
(Lab(50.0000, 2.8361, -74.0200), Lab(50.0000, 0.0000, -82.7485), 2.4543, 2.4066),
(Lab(50.0000, -1.3802, -84.2814), Lab(50.0000, 0.0000, -82.7485), 0.6845, 0.6980),
(Lab(50.0000, -1.1848, -84.8006), Lab(50.0000, 0.0000, -82.7485), 0.6696, 0.6719),
(Lab(50.0000, -0.9009, -85.5211), Lab(50.0000, 0.0000, -82.7485), 0.6919, 0.6772),
(Lab(50.0000, 0.0000, 0.0000), Lab(50.0000, -1.0000, 2.0000), 2.2361, 2.2361),
(Lab(50.0000, -1.0000, 2.0000), Lab(50.0000, 0.0000, 0.0000), 2.0316, 2.0193),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0009), 4.8007, 4.8122),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0010), 4.8007, 4.8122),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0011), 4.8007, 4.8122),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0012), 4.8007, 4.8122),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0009, -2.4900), 4.8007, 4.8122),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0010, -2.4900), 4.8007, 4.8122),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0011, -2.4900), 4.8007, 4.8122),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 0.0000, -2.5000), 3.4077, 3.4160),
(Lab(50.0000, 2.5000, 0.0000), Lab(73.0000, 25.0000, -18.0000), 34.6892, 28.2503),
(Lab(50.0000, 2.5000, 0.0000), Lab(61.0000, -5.0000, 29.0000), 29.4414, 27.7308),
(Lab(50.0000, 2.5000, 0.0000), Lab(56.0000, -27.0000, -3.0000), 27.9141, 27.3286),
(Lab(50.0000, 2.5000, 0.0000), Lab(58.0000, 24.0000, 15.0000), 24.9377, 23.8076),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.1736, 0.5854), 0.8221, 0.8194),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.2972, 0.0000), 0.7166, 0.7118),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 1.8634, 0.5757), 0.8049, 0.8041),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.2592, 0.3350), 0.7528, 0.7488),
(Lab(60.2574, -34.0099, 36.2677), Lab(60.4626, -34.1751, 39.4387), 1.3910, 1.3897),
(Lab(63.0109, -31.0961, -5.8663), Lab(62.8187, -29.7946, -4.0864), 1.2481, 1.2441),
(Lab(61.2901, 3.7196, -5.3901), Lab(61.4292, 2.2480, -4.9620), 1.2980, 1.2884),
(Lab(35.0831, -44.1164, 3.7933), Lab(35.0232, -40.0716, 1.5901), 1.8205, 1.7958),
(Lab(22.7233, 20.0904, -46.6940), Lab(23.0331, 14.9730, -42.5619), 2.5561, 2.5310),
(Lab(36.4612, 47.8580, 18.3852), Lab(36.2715, 50.5065, 21.2231), 1.4249, 1.3991),
(Lab(90.8027, -2.0831, 1.4410), Lab(91.1528, -1.6435, 0.0447), 1.4195, 1.3858),
(Lab(90.9257, -0.5406, -0.9208), Lab(88.6381, -0.8985, -0.7239), 2.3226, 1.2123),
(Lab( 6.7747, -0.2908, -2.4247), Lab( 5.8714, -0.0985, -2.2286), 0.9385, 0.5182),
(Lab( 2.0776, 0.0795, -1.1350), Lab( 0.9033, -0.0636, -0.5514), 1.3065, 0.8191),
]
for color1, color2, diffg, difft in values:
assert isclose(de.cie1994g(color1, color2), diffg, abs_tol=1e-4)
assert isclose(de.cie1994t(color1, color2), difft, abs_tol=1e-4)
def test_ciede2000_known():
# Test values from Sharma 2005:
# http://www.ece.rochester.edu/~gsharma/ciede2000/ciede2000noteCRNA.pdf
# pylint: disable=bad-whitespace
values = [
# color1, color2, delta-e
(Lab(50.0000, 2.6772, -79.7751), Lab(50.0000, 0.0000, -82.7485), 2.0425),
(Lab(50.0000, 3.1571, -77.2803), Lab(50.0000, 0.0000, -82.7485), 2.8615),
(Lab(50.0000, 2.8361, -74.0200), Lab(50.0000, 0.0000, -82.7485), 3.4412),
(Lab(50.0000, -1.3802, -84.2814), Lab(50.0000, 0.0000, -82.7485), 1.0000),
(Lab(50.0000, -1.1848, -84.8006), Lab(50.0000, 0.0000, -82.7485), 1.0000),
(Lab(50.0000, -0.9009, -85.5211), Lab(50.0000, 0.0000, -82.7485), 1.0000),
(Lab(50.0000, 0.0000, 0.0000), Lab(50.0000, -1.0000, 2.0000), 2.3669),
(Lab(50.0000, -1.0000, 2.0000), Lab(50.0000, 0.0000, 0.0000), 2.3669),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0009), 7.1792),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0010), 7.1792),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0011), 7.2195),
(Lab(50.0000, 2.4900, -0.0010), Lab(50.0000, -2.4900, 0.0012), 7.2195),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0009, -2.4900), 4.8045),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0010, -2.4900), 4.8045),
(Lab(50.0000, -0.0010, 2.4900), Lab(50.0000, 0.0011, -2.4900), 4.7461),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 0.0000, -2.5000), 4.3065),
(Lab(50.0000, 2.5000, 0.0000), Lab(73.0000, 25.0000, -18.0000), 27.1492),
(Lab(50.0000, 2.5000, 0.0000), Lab(61.0000, -5.0000, 29.0000), 22.8977),
(Lab(50.0000, 2.5000, 0.0000), Lab(56.0000, -27.0000, -3.0000), 31.9030),
(Lab(50.0000, 2.5000, 0.0000), Lab(58.0000, 24.0000, 15.0000), 19.4535),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.1736, 0.5854), 1.0000),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.2972, 0.0000), 1.0000),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 1.8634, 0.5757), 1.0000),
(Lab(50.0000, 2.5000, 0.0000), Lab(50.0000, 3.2592, 0.3350), 1.0000),
(Lab(60.2574, -34.0099, 36.2677), Lab(60.4626, -34.1751, 39.4387), 1.2644),
(Lab(63.0109, -31.0961, -5.8663), Lab(62.8187, -29.7946, -4.0864), 1.2630),
(Lab(61.2901, 3.7196, -5.3901), Lab(61.4292, 2.2480, -4.9620), 1.8731),
(Lab(35.0831, -44.1164, 3.7933), Lab(35.0232, -40.0716, 1.5901), 1.8645),
(Lab(22.7233, 20.0904, -46.6940), Lab(23.0331, 14.9730, -42.5619), 2.0373),
(Lab(36.4612, 47.8580, 18.3852), Lab(36.2715, 50.5065, 21.2231), 1.4146),
(Lab(90.8027, -2.0831, 1.4410), Lab(91.1528, -1.6435, 0.0447), 1.4441),
(Lab(90.9257, -0.5406, -0.9208), Lab(88.6381, -0.8985, -0.7239), 1.5381),
(Lab( 6.7747, -0.2908, -2.4247), Lab( 5.8714, -0.0985, -2.2286), 0.6377),
(Lab( 2.0776, 0.0795, -1.1350), Lab( 0.9033, -0.0636, -0.5514), 0.9082),
]
for color1, color2, diff in values:
assert isclose(de.ciede2000(color1, color2), diff, abs_tol=1e-4)
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