[PYTHON] Convert color space from RGB to CIELAB with PIL (Pillow)

Mutual conversion between RGB and CIELAB is done using PIL.ImageCms instead of PIL.Image.convert.

from PIL import Image, ImageCms

im = Image.open(image_path)
if im.mode != "RGB":
  im = im.convert("RGB")

srgb_profile = ImageCms.createProfile("sRGB")
lab_profile  = ImageCms.createProfile("LAB")

rgb2lab_transform = ImageCms.buildTransformFromOpenProfiles(srgb_profile, lab_profile, "RGB", "LAB")
lab_im = ImageCms.applyTransform(im, rgb2lab_transform)

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