Troubleshooting #71

One of my complaints about color space conversion within ImageJ is that either a) it's a black box, or b) it only goes to one illuminant. I like the implementation of the color calculator, as it's functionally identical to the excellent Bruce Lindbloom one. Is there a way to use this to convert an image?

@bhorlor1 That was planned for a while, #11. It is implemented at the backend, but not yet in the UI. Added it to the milestone.