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

[DJ]

Hi Gimp-user,

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?  

Thank you.

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__________________________     
DJ