fish2000 / colorpy Goto Github PK

from colorpy import colormodels as cm

class ColorPy(object):
  @staticmethod
  def irgb2lab(r, g, b):
    irgb = cm.irgb_color(r, g, b)
    rgb = cm.rgb_from_irgb(irgb)
    xyz = cm.xyz_from_rgb(rgb)
    lab = cm.lab_from_xyz(xyz)
    return lab

  @staticmethod
  def rgb2lab(r, g, b):
    rgb = cm.rgb_color(r, g, b)
    xyz = cm.xyz_from_rgb(rgb)
    lab = cm.lab_from_xyz(xyz)
    return lab

  @staticmethod
  def rgb2xyz(r, g, b):
    rgb = cm.rgb_color(r, g, b)
    xyz = cm.xyz_from_rgb(rgb)
    return xyz

Try to convert gray rgb_color(.5, .5, .5) should be near ('xyzColorMath', '0.203 0.214 0.233') but is ('xyzColorPy', '0.475 0.500 0.545').
http://www.easyrgb.com/index.php?X=CALC#Result
http://www.workwithcolor.com/

(('rgb', (0.5, 0.5, 0.5), [128.0, 128.0, 128.0]),
 ('xyzColorPy', '0.475 0.500 0.545'),
 ('xyzColorMath', '0.203 0.214 0.233'),
 ('labColorPy', '76.069 0.000 0.000'),
 ('labColorMath', '53.389 -0.000 -0.005'))

Since you seem to be the owner of the PyPI version of colorpy, can you please upload the latest version? The version currently posted is not python 3 compatible. Thanks in advance!

Please comapre results of CIE lab colorpy:
https://www.dropbox.com/s/icv3uz3xlndg0nm/cielab2.png

with colormath CIE lab:
https://www.dropbox.com/s/4pqglkzbi66p1v5/cielab.png

As I found there is problem with luminance for red - colorpy give higher luminance than the most libraries and it is not explained.

Luv is also strange - i am using color fixes so if not in range it is cut to 255, 0 - it is not the best but should not impact too much d65 used.

colorpy:
https://www.dropbox.com/s/bhy9ckbwrsgtrjp/cieluv2.png

colormath:
https://www.dropbox.com/s/jdgf03su72vwfzo/cieluv.png