def lab_to_xyz(l, a, b, *rest):
# see http://www.easyrgb.com/index.php?X=MATH&H=08#text8
f_y = (l * 100. + 16.) / 116.
x, y, z = a / 5. + f_y, f_y, f_y - b / 2.
x, y, z = map(_scale_lab_to_xyz, (x, y, z))
x, y, z = [u * v for u, v in zip((x, y, z), _ref_white.xyz)]
x, y, z = clip([x, y, z], 0, 1)
return (x, y, z) + rest
def lab_to_xyz(l, a, b, *rest):
# see http://www.easyrgb.com/index.php?X=MATH&H=08#text8
f_y = (l * 100. + 16.) / 116.
x, y, z = a / 5. + f_y, f_y, f_y - b / 2.
x, y, z = map(_scale_lab_to_xyz, (x, y, z))
x, y, z = [u * v for u, v in zip((x, y, z), _ref_white.xyz)]
x, y, z = clip([x, y, z], 0, 1)
return (x, y, z) + rest
def luv_to_xyz(cie_l, cie_u, cie_v, *rest):
# see http://www.easyrgb.com/index.php?X=MATH&H=17#text17
u = cie_u / (13. * cie_l) + _ref_white.u_r
v = cie_v / (13. * cie_l) + _ref_white.v_r
cie_l_100 = cie_l * 100.0 # MMA specific
y = (cie_l_100 + 16.) / 116.
y = _scale_lab_to_xyz(y)
x = -(9 * y * u) / ((u - 4) * v - u * v)
z = (9 * y - (15 * v * y) - (v * x)) / (3 * v)
cie_l_is_zero = cie_l < 0.078
x, y, z = map(lambda t: _luv_to_xyz_clip_zero(cie_l_is_zero, t), (x, y, z))
x, y, z = clip([x, y, z], 0, 1)
return (x, y, z) + rest
def luv_to_xyz(cie_l, cie_u, cie_v, *rest):
# see http://www.easyrgb.com/index.php?X=MATH&H=17#text17
u = cie_u / (13. * cie_l) + _ref_white.u_r
v = cie_v / (13. * cie_l) + _ref_white.v_r
cie_l_100 = cie_l * 100.0 # MMA specific
y = (cie_l_100 + 16.) / 116.
y = _scale_lab_to_xyz(y)
x = -(9 * y * u) / ((u - 4) * v - u * v)
z = (9 * y - (15 * v * y) - (v * x)) / (3 * v)
cie_l_is_zero = cie_l < 0.078
x, y, z = map(lambda t: _luv_to_xyz_clip_zero(cie_l_is_zero, t), (x, y, z))
x, y, z = clip([x, y, z], 0, 1)
return (x, y, z) + rest
def _clip1(t):
return clip(t, 0, 1)
def testClip(self):
a = array([[[-0.1, 0.6], [-1.8, -0.4]], [[0.1, 0.8], [1.1, 0.5]]])
a = clip(a, 0, 1)
self.assertEqualArrays(
a, [[[0., 0.6], [0., 0.]], [[0.1, 0.8], [1., 0.5]]])
def testClip(self):
a = array([[[-0.1, 0.6], [-1.8, -0.4]], [[0.1, 0.8], [1.1, 0.5]]])
a = clip(a, 0, 1)
self.assertEqualArrays(a, [[[0., 0.6], [0., 0.]], [[0.1, 0.8], [1., 0.5]]])
def _clip1(t):
return clip(t, 0, 1)
