def XYZ_to_Luv(cobj, *args, **kwargs):
"""
Convert from XYZ to Luv
"""
temp_x = cobj.xyz_x
temp_y = cobj.xyz_y
temp_z = cobj.xyz_z
denom = temp_x + (15.0 * temp_y) + (3.0 * temp_z)
# avoid division by zero
if denom == 0.0:
luv_u = 0.0
luv_v = 0.0
else:
luv_u = (4.0 * temp_x) / denom
luv_v = (9.0 * temp_y) / denom
illum = cobj.get_illuminant_xyz()
temp_y = temp_y / illum["Y"]
if temp_y > color_constants.CIE_E:
temp_y = math.pow(temp_y, (1.0 / 3.0))
else:
temp_y = (7.787 * temp_y) + (16.0 / 116.0)
ref_U = (4.0 * illum["X"]) / (illum["X"] + (15.0 * illum["Y"]) + (3.0 * illum["Z"]))
ref_V = (9.0 * illum["Y"]) / (illum["X"] + (15.0 * illum["Y"]) + (3.0 * illum["Z"]))
luv_l = (116.0 * temp_y) - 16.0
luv_u = 13.0 * luv_l * (luv_u - ref_U)
luv_v = 13.0 * luv_l * (luv_v - ref_V)
return LuvColor(
luv_l, luv_u, luv_v, observer=cobj.observer, illuminant=cobj.illuminant)
def LCHuv_to_Luv(cobj, *args, **kwargs):
"""
Convert from LCH(uv) to Luv.
"""
luv_l = cobj.lch_l
luv_u = math.cos(math.radians(cobj.lch_h)) * cobj.lch_c
luv_v = math.sin(math.radians(cobj.lch_h)) * cobj.lch_c
return LuvColor(
luv_l, luv_u, luv_v, illuminant=cobj.illuminant, observer=cobj.observer)
plt.imshow(value)
plt.colorbar()
plt.savefig('value.pdf', bbox_inches='tight')
plt.close()
plt.imshow(error)
plt.colorbar()
plt.savefig('error.pdf', bbox_inches='tight')
plt.close()
total = numpy.zeros((value.shape[0], value.shape[1], 3))
for i in range(len(x)):
for j in range(len(y)):
h = value[i, j] / 2 + 0.5
h = math.fmod(h + 2, 1)
#h = 0.25
#v = 1 - h
v = 0.
l = error[i, j]**0.5
l = max(min(l, 1), 0)
rgb = convert_color(
LuvColor(luv_l=l * 100, luv_u=h * 100, luv_v=v * 100), sRGBColor)
#print(rgb.get_value_tuple())
rgb = [rgb.clamped_rgb_r, rgb.clamped_rgb_g, rgb.clamped_rgb_b]
total[i, j, :] = rgb
plt.imshow(total)
plt.savefig('lab.pdf', bbox_inches='tight')
plt.close()
def luv_to_rgb(luv):
luvcolor = LuvColor(*luv)
rgbcolor = luvcolor.convert_to('rgb')
return (rgbcolor.rgb_r, rgbcolor.rgb_g, rgbcolor.rgb_b)
def test_conversion_to_luv(self):
luv = convert_color(self.color, LuvColor)
self.assertColorMatch(luv, LuvColor(1.807, -2.564, -0.894))
def setUp(self):
self.color = LuvColor(1.807, -2.564, -0.894)
def test_conversion_to_luv(self):
luv = convert_color(self.color, LuvColor)
self.assertColorMatch(luv, LuvColor(51.837, -73.561, -25.657))