def set_convertor(name, ill='D65'):
""" Binds the conversion functions LCH2RGB() and RGB2LCH() to the choosen colour package
"""
global LCH2RGB, RGB2LCH, convertor, illuminant
if name not in ['custom', 'colorspacious', 'colourscience']:
print("Unknown conversion module")
return
convertor = name
illuminant = ill
if name == 'custom':
LCH2RGB = lambda L, C, H: XYZ2RGB(Lab2XYZ(LCH2Lab((L, C, H))))
RGB2LCH = lambda R, G, B: Lab2LCH(XYZ2Lab(RGB2XYZ((R, G, B))))
if name == 'colorspacious':
from colorspacious import cspace_convert
func_LCH2RGB = lambda L, C, H: cspace_convert([L, C, H], {
"name": "CIELCh",
"XYZ100_w": ill
}, "sRGB1")
func_RGB2LCH = lambda R, G, B: cspace_convert([R, G, B], "sRGB1", {
"name": "CIELCh",
"XYZ100_w": ill
})
if name == 'colourscience':
import colour as cs
cs_ill = cs.ILLUMINANTS['CIE 1931 2 Degree Standard Observer'][ill]
func_LCH2RGB = lambda L, C, H: cs.XYZ_to_sRGB(
cs.Lab_to_XYZ(cs.LCHab_to_Lab([L, C, H]), illuminant=cs_ill))
func_RGB2LCH = lambda R, G, B: cs.Lab_to_LCHab(
cs.XYZ_to_Lab(cs.sRGB_to_XYZ([R, G, B]), illuminant=cs_ill))
if name == 'colorspacious' or name == 'colourscience':
def LCH2RGB(L, C, H):
if hasattr(L, '__iter__'):
RGB = np.array(list(map(func_LCH2RGB, L, C, H)))
R = RGB[:, 0]
G = RGB[:, 1]
B = RGB[:, 2]
else:
R, G, B = func_LCH2RGB(L, C, H)
return R, G, B
def RGB2LCH(R, G, B):
if hasattr(R, '__iter__'):
LCH = np.array(list(map(func_RGB2LCH, R, G, B)))
L = LCH[:, 0]
C = LCH[:, 1]
H = LCH[:, 2]
else:
L, C, H = func_RGB2LCH(R, G, B)
return L, C, H
print("convertor = '%s' (illuminant = '%s')" % (name, illuminant))
print(colour.Lab_to_XYZ(Lab))
print('\n')
message_box(('Converting to "CIE LCHab" colourspace from given "CIE Lab" '
'colourspace values:\n'
'\n\t{0}'.format(Lab)))
print(colour.Lab_to_LCHab(Lab))
print('\n')
LCHab = (100.00000000, 42.41254357, 46.90195532)
message_box(('Converting to "CIE Lab" colourspace from given "CIE LCHab" '
'colourspace values:\n'
'\n\t{0}'.format(LCHab)))
print(colour.LCHab_to_Lab(LCHab))
print('\n')
XYZ = (114.17634600, 100.00000000, 49.81520600)
message_box(('Converting to "Hunter L,a,b" colour scale from given "CIE XYZ" '
'tristimulus values:\n'
'\n\t{0}'.format(XYZ)))
print(colour.XYZ_to_Hunter_Lab(XYZ))
print('\n')
Lab = (100.00000000, 32.03822364, 23.14715286)
message_box(('Converting to "CIE XYZ" tristimulus values from given '
'"Hunter L,a,b" colour scale values:\n'
'\n\t{0}'.format(Lab)))