I don't know about you, but this is just what I needed.
Many times, I need to get more specific as to the tone I want to select. Whether it be a darker green of a tree, or a lighter green which may have a greater or lesser effect on the surrounding grass and foliage, or a shade of color in a large flower, many times I have to be selective, and what's more, to remember what I clicked on three days ago.

Lots of times, the tone or color I clicked on looks different in that sample block. I click on a white egret and that sample block seems to be slightly blue.... green leaves, almost black.... hard to tell what I clicked on before.
Now one click and I get a location of my previously selected location.

See the attached screen snaps. It wasn't that easy to find for me.
Have fun with Qimage Ultimate.... it keeps getting better and better.

Fred