color difference functions

[Stéfan van der Walt]

Hi Matt

On Fri, Jul 19, 2013 at 1:36 AM, Matt Terry <matt.terry at gmail.com> wrote:
> Would color difference functions [1] be of interest to skimage?  I have the
> distance functions for CIE76, CIEDE94, CIEDE2000 and CMC l:c if you think
> the would be of general interest.

Those fit in very well with the scope of the ``skimage.color`` module.
 I think especially if we can have docstrings that teach the user a
bit more about the topic, this would be highly useful in the classroom
too.

Stéfan