Photoshop Histogram
I'm a newbie to Photoshop, myself. But Photoshop allows you to scan your photo, almost pixel by pixel, and tells you the values of R, G, and B whereever your cursor is on the photo. If it is in b&w, it will give you a pixel by pixel grayscale rating -- degree of black or white.
I'm just getting into the program, but it looks as though it will be very useful.
Another thing it will do (I'm told) is let you take photos apart and do something like cut and paste different parts. For instance, I'm finishing a portrait of a woman who had her photo taken 10 years ago in Australia. She is holding a koala bear. But since then, she has had her hair completely re-styled, and she's lost weight. So, we took new photos, and I put the old koala bear in the arms of the "new woman." If I had known how to use Photoshop, I could have done it all onscreen, and then printed it out. As it was, I had to do my own cutting and pasting.
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