[Gimp-user] Picking Gray Point in a Photograph and recalling pixel points

[laptop]

> I was following this tutorial.
> http://digital-photography-school.com/precise-color-cast-correction-with-gray-fill-layers
> 
> I added a 50% Gray Layer (7f7f7f), Mode: Difference. I picked a point
> that was black, referencing the Pointer Dialog, and jotted down the
> x/y coordinate found in the lower left-hand corner or Pointer Dialog.
> 
> I brought up the Levels Dialog and clicked the middle eye dropper for
> picking the gray point, and carefully relocated that same x/y
> coordinate.
> 
> My question, is there another way to remember or set the gray point,
> or remember any point for future reference/recall?  

Have a look at Sample points dialogue.

Norman