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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.conversions 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
import pytest
from colorzero import conversions as cv
def frange(start, stop, step):
i = 0
while True:
value = start + (i * step)
if value > stop:
break
yield value
i += 1
def verify_floats(color1, color2, abs_tol=1e-7):
for elem1, elem2 in zip(color1, color2):
assert isclose(elem1, elem2, abs_tol=abs_tol)
def verify_ints(color1, color2, abs_tol=1):
for elem1, elem2 in zip(color1, color2):
assert abs(elem1 - elem2) <= abs_tol
# Stop pylint warning about pytest fixtures
# pylint: disable=redefined-outer-name
@pytest.fixture(params=(
(r, g, b)
for r in frange(0.0, 1.0, 0.2)
for g in frange(0.0, 1.0, 0.2)
for b in frange(0.0, 1.0, 0.2)
))
def rgb(request):
return request.param
@pytest.fixture(params=(
(r, g, b)
for r in range(0, 255, 64)
for g in range(0, 255, 64)
for b in range(0, 255, 64)
))
def rgb_bytes(request):
return request.param
@pytest.fixture()
def html7(request, rgb_bytes):
# pylint: disable=unused-argument
return '#%02x%02x%02x' % rgb_bytes
@pytest.fixture(params=(
(r, g, b)
for r in range(0, 0xf, 0x4)
for g in range(0, 0xf, 0x4)
for b in range(0, 0xf, 0x4)
))
def html3(request):
return '#%x%x%x' % request.param
def test_yiq_roundtrip(rgb):
verify_floats(cv.yiq_to_rgb(*cv.rgb_to_yiq(*rgb)), rgb)
def test_yiq_knowns():
# pylint: disable=bad-whitespace
values = [
# rgb, yiq
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (0.11, -0.3217, 0.3121)), # blue
((0.0, 1.0, 0.0), (0.59, -0.2773, -0.5251)), # green
((0.0, 1.0, 1.0), (0.7, -0.599, -0.213)), # cyan
((1.0, 0.0, 0.0), (0.3, 0.599, 0.213)), # red
((1.0, 0.0, 1.0), (0.41, 0.2773, 0.5251)), # purple
((1.0, 1.0, 0.0), (0.89, 0.3217, -0.3121)), # yellow
((1.0, 1.0, 1.0), (1.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.5, 0.0, 0.0)), # grey
]
for rgb, yiq in values:
verify_floats(cv.rgb_to_yiq(*rgb), yiq)
verify_floats(cv.yiq_to_rgb(*yiq), rgb)
def test_hls_roundtrip(rgb):
verify_floats(cv.hls_to_rgb(*cv.rgb_to_hls(*rgb)), rgb)
def test_hls_knowns(rgb):
# pylint: disable=bad-whitespace
values = [
# rgb, hls
((0.0, 0.0, 0.0), ( 0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (4/6, 0.5, 1.0)), # blue
((0.0, 1.0, 0.0), (2/6, 0.5, 1.0)), # green
((0.0, 1.0, 1.0), (3/6, 0.5, 1.0)), # cyan
((1.0, 0.0, 0.0), ( 0, 0.5, 1.0)), # red
((1.0, 0.0, 1.0), (5/6, 0.5, 1.0)), # purple
((1.0, 1.0, 0.0), (1/6, 0.5, 1.0)), # yellow
((1.0, 1.0, 1.0), ( 0, 1.0, 0.0)), # white
((0.5, 0.5, 0.5), ( 0, 0.5, 0.0)), # grey
]
for rgb, hls in values:
verify_floats(cv.rgb_to_hls(*rgb), hls)
verify_floats(cv.hls_to_rgb(*hls), rgb)
def test_hsv_roundtrip(rgb):
verify_floats(cv.hsv_to_rgb(*cv.rgb_to_hsv(*rgb)), rgb)
def test_hsv_knowns():
# pylint: disable=bad-whitespace
values = [
# rgb, hsv
((0.0, 0.0, 0.0), ( 0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (4/6, 1.0, 1.0)), # blue
((0.0, 1.0, 0.0), (2/6, 1.0, 1.0)), # green
((0.0, 1.0, 1.0), (3/6, 1.0, 1.0)), # cyan
((1.0, 0.0, 0.0), ( 0, 1.0, 1.0)), # red
((1.0, 0.0, 1.0), (5/6, 1.0, 1.0)), # purple
((1.0, 1.0, 0.0), (1/6, 1.0, 1.0)), # yellow
((1.0, 1.0, 1.0), ( 0, 0.0, 1.0)), # white
((0.5, 0.5, 0.5), ( 0, 0.0, 0.5)), # grey
]
for rgb, hsv in values:
verify_floats(cv.rgb_to_hsv(*rgb), hsv)
verify_floats(cv.hsv_to_rgb(*hsv), rgb)
def test_rgb_bytes_roundtrip(rgb):
verify_floats(cv.rgb_bytes_to_rgb(*cv.rgb_to_rgb_bytes(*rgb)), rgb)
def test_rgb_bytes_known():
# pylint: disable=bad-whitespace
values = [
# rgb, bytes
((0.0, 0.0, 0.0), (0, 0, 0)), # black
((0.0, 0.0, 1.0), (0, 0, 255)), # blue
((0.0, 1.0, 0.0), (0, 255, 0)), # green
((0.0, 1.0, 1.0), (0, 255, 255)), # cyan
((1.0, 0.0, 0.0), (255, 0, 0)), # red
((1.0, 0.0, 1.0), (255, 0, 255)), # purple
((1.0, 1.0, 0.0), (255, 255, 0)), # yellow
((1.0, 1.0, 1.0), (255, 255, 255)), # white
((0.4, 0.4, 0.4), (102, 102, 102)), # grey
]
for rgb, b in values:
assert cv.rgb_to_rgb_bytes(*rgb) == b
assert cv.rgb_bytes_to_rgb(*b) == rgb
def test_rgb24_roundtrip(rgb_bytes):
assert cv.rgb24_to_rgb_bytes(cv.rgb_bytes_to_rgb24(*rgb_bytes)) == rgb_bytes
def test_rgb24_known():
# pylint: disable=bad-whitespace
values = [
# rgb, rgb24
((0, 0, 0), 0), # black
((0, 0, 255), 0xff0000), # blue
((0, 255, 0), 0xff00), # green
((0, 255, 255), 0xffff00), # cyan
((255, 0, 0), 0xff), # red
((255, 0, 255), 0xff00ff), # purple
((255, 255, 0), 0xffff), # yellow
((255, 255, 255), 0xffffff), # white
((102, 102, 102), 0x666666), # grey
]
for rgb, rgb24 in values:
assert cv.rgb24_to_rgb_bytes(rgb24) == rgb
assert cv.rgb_bytes_to_rgb24(*rgb) == rgb24
def test_rgb_html7_roundtrip(html7):
assert cv.rgb_bytes_to_html(*cv.html_to_rgb_bytes(html7)) == html7
def test_rgb_html3_roundtrip(html3):
v = '#' + html3[1] + html3[1] + html3[2] + html3[2] + html3[3] + html3[3]
assert cv.rgb_bytes_to_html(*cv.html_to_rgb_bytes(html3)) == v
def test_html_known():
# pylint: disable=bad-whitespace
values = [
# rgb, html
((0, 0, 0), '#000000'), # black
((0, 0, 255), '#0000ff'), # blue
((0, 255, 0), '#00ff00'), # green
((0, 255, 255), '#00ffff'), # cyan
((255, 0, 0), '#ff0000'), # red
((255, 0, 255), '#ff00ff'), # purple
((255, 255, 0), '#ffff00'), # yellow
((255, 255, 255), '#ffffff'), # white
((102, 102, 102), '#666666'), # grey
]
for rgb, rgb24 in values:
assert cv.html_to_rgb_bytes(rgb24) == rgb
assert cv.rgb_bytes_to_html(*rgb) == rgb24
def test_html_bad():
with pytest.raises(ValueError):
cv.html_to_rgb_bytes('#1')
with pytest.raises(ValueError):
cv.html_to_rgb_bytes('#11223344')
def test_cmy_roundtrip(rgb):
verify_floats(cv.cmy_to_rgb(*cv.rgb_to_cmy(*rgb)), rgb)
def test_cmy_known():
# pylint: disable=bad-whitespace
values = [
# rgb, cmy
((0.0, 0.0, 0.0), (1.0, 1.0, 1.0)), # black
((0.0, 0.0, 1.0), (1.0, 1.0, 0.0)), # blue
((0.0, 1.0, 0.0), (1.0, 0.0, 1.0)), # green
((0.0, 1.0, 1.0), (1.0, 0.0, 0.0)), # cyan
((1.0, 0.0, 0.0), (0.0, 1.0, 1.0)), # red
((1.0, 0.0, 1.0), (0.0, 1.0, 0.0)), # purple
((1.0, 1.0, 0.0), (0.0, 0.0, 1.0)), # yellow
((1.0, 1.0, 1.0), (0.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.5, 0.5, 0.5)), # grey
]
for rgb, cmy in values:
verify_floats(cv.rgb_to_cmy(*rgb), cmy)
verify_floats(cv.cmy_to_rgb(*cmy), rgb)
def test_cmyk_roundtrip(rgb):
verify_floats(
cv.cmy_to_rgb(
*cv.cmyk_to_cmy(
*cv.cmy_to_cmyk(
*cv.rgb_to_cmy(*rgb)))), rgb)
def test_cmyk_known():
# pylint: disable=bad-whitespace
values = [
# rgb, cmyk
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0, 1.0)), # black
((0.0, 0.0, 1.0), (1.0, 1.0, 0.0, 0.0)), # blue
((0.0, 1.0, 0.0), (1.0, 0.0, 1.0, 0.0)), # green
((0.0, 1.0, 1.0), (1.0, 0.0, 0.0, 0.0)), # cyan
((1.0, 0.0, 0.0), (0.0, 1.0, 1.0, 0.0)), # red
((1.0, 0.0, 1.0), (0.0, 1.0, 0.0, 0.0)), # purple
((1.0, 1.0, 0.0), (0.0, 0.0, 1.0, 0.0)), # yellow
((1.0, 1.0, 1.0), (0.0, 0.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.0, 0.0, 0.0, 0.5)), # grey
]
for rgb, cmyk in values:
verify_floats(cv.cmy_to_cmyk(*cv.rgb_to_cmy(*rgb)), cmyk)
verify_floats(cv.cmy_to_rgb(*cv.cmyk_to_cmy(*cmyk)), rgb)
def test_yuv_roundtrip(rgb):
verify_floats(cv.yuv_to_rgb(*cv.rgb_to_yuv(*rgb)), rgb)
def test_yuv_knowns():
# pylint: disable=bad-whitespace
values = [
# rgb, yuv
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (0.114, 0.436, -0.10001)), # blue
((0.0, 1.0, 0.0), (0.587, -0.28886, -0.51498)), # green
((0.0, 1.0, 1.0), (0.701, 0.14714, -0.615)), # cyan
((1.0, 0.0, 0.0), (0.299, -0.14714, 0.615)), # red
((1.0, 0.0, 1.0), (0.413, 0.28886, 0.51498)), # purple
((1.0, 1.0, 0.0), (0.886, -0.436, 0.10001)), # yellow
((1.0, 1.0, 1.0), (1.0, 0.0, 0.0)), # white
((0.5, 0.5, 0.5), (0.5, 0.0, 0.0)), # grey
]
for rgb, yuv in values:
verify_floats(cv.rgb_to_yuv(*rgb), yuv, abs_tol=1e-5)
verify_floats(cv.yuv_to_rgb(*yuv), rgb, abs_tol=1e-5)
def test_yuv_bytes_roundtrip(rgb_bytes):
# Tolerance of 2 here to allow for accumulated error in the roundtrip
verify_ints(
cv.yuv_bytes_to_rgb_bytes(*cv.rgb_bytes_to_yuv_bytes(*rgb_bytes)),
rgb_bytes, abs_tol=2)
def test_yuv_bytes_knowns():
# pylint: disable=bad-whitespace
values = [
# rgb, yuv
((0, 0, 0), (16, 128, 128)), # black
((0, 0, 255), (41, 240, 110)), # blue
((0, 255, 0), (144, 54, 34)), # green
((0, 255, 255), (169, 166, 16)), # cyan
((255, 0, 0), (82, 90, 240)), # red
((255, 0, 255), (107, 202, 222)), # purple
((255, 255, 0), (210, 16, 146)), # yellow
((255, 255, 255), (235, 128, 128)), # white
((102, 102, 102), (104, 128, 128)), # grey
]
for rgb, yuv in values:
verify_ints(cv.rgb_bytes_to_yuv_bytes(*rgb), yuv)
verify_ints(cv.yuv_bytes_to_rgb_bytes(*yuv), rgb)
def test_yuv_coefficients():
with pytest.raises(TypeError):
cv.YUVCoefficients()
def test_xyz_roundtrip(rgb):
# XYZ is a more complex conversion and tends to lose more precision during
# the round-trip
verify_floats(cv.xyz_to_rgb(*cv.rgb_to_xyz(*rgb)), rgb, abs_tol=1e-5)
def test_xyz_known():
# pylint: disable=bad-whitespace
values = [
# rgb, xyz
((0.0, 0.0, 0.0), (0.0, 0.0, 0.0)), # black
((0.0, 0.0, 1.0), (0.18043, 0.07217, 0.95030)), # blue
((0.0, 1.0, 0.0), (0.35758, 0.71515, 0.11919)), # green
((0.0, 1.0, 1.0), (0.53801, 0.78733, 1.06950)), # cyan
((1.0, 0.0, 0.0), (0.41246, 0.21267, 0.01933)), # red
((1.0, 0.0, 1.0), (0.59289, 0.28485, 0.96964)), # purple
((1.0, 1.0, 0.0), (0.77003, 0.92782, 0.13852)), # yellow
((1.0, 1.0, 1.0), (0.95047, 1.00000, 1.08883)), # white
((0.5, 0.5, 0.5), (0.20344, 0.21404, 0.23305)), # grey
]
for rgb, xyz in values:
verify_floats(cv.rgb_to_xyz(*rgb), xyz, abs_tol=1e-5)
# The XYZ values above are very rough approximations, hence the huge
# tolerance here
verify_floats(cv.xyz_to_rgb(*xyz), rgb, abs_tol=1e-3)
def test_lab_roundtrip(rgb):
verify_floats(
cv.xyz_to_rgb(
*cv.lab_to_xyz(
*cv.xyz_to_lab(
*cv.rgb_to_xyz(*rgb)))), rgb, abs_tol=1e-5)
def test_luv_roundtrip(rgb):
verify_floats(
cv.xyz_to_rgb(
*cv.luv_to_xyz(
*cv.xyz_to_luv(
*cv.rgb_to_xyz(*rgb)))), rgb, abs_tol=1e-5)
def test_bad_html():
with pytest.raises(ValueError):
cv.html_to_rgb_bytes('foo')
with pytest.raises(ValueError):
cv.html_to_rgb_bytes('#foo')
def test_bad_name():
with pytest.raises(ValueError):
cv.name_to_html('foo')
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