Organising by value

This would have worked a lot better if I hadn't had a bad knee. But anyway I laid them all out on the floor except the very palest which were already sorted. Took this photo..

Then I turned it black and white. You can see now that those red ones are in fact quite dark, because they're bright the eye gets confused and allocates them a paler value.

Stupidly I got down on my knees with a print out of the black and white photo and yelped in pain. Once down there I ended up rolling on the floor, photo in had picking up various bits as I went.
Now to do the same with the remainder, only not on my knees this time!