Hi everybody. I wanted to look into doing a RGB2Lab conversion in skimage but I got a bit confused with the different color spaces. The standard method to go from RGB to Lab seems to be via XYZ.

I compared the way that RGB2XYZ is done in scikits-image, vl_feat and the SLIC code, and they seem to be three different ways.

As I want to use Lab for the segmentation methods by the vl_feat authors and SLIC, I feel this is a bit unfortunate.

The difference between wikipedia, skimage and vl_feat seems to be that vl_feat does a gamma-correction of 2.2. SLIC does something else that I don't really understand.

Could someone help me understand the differences so that I can try and reproduce other peoples' results?

Cheers, Andy