> > The original tutorial that I was following at > > http://digital-photography-school.com/precise-color-cast-correction-with-gray-fill-layers > > had the user add a temporary 50% Gray Layer (7f7f7f), Mode: Difference > > to find a gray point. I manually picked the point, wrote it down on a > > piece of paper, and then relocated that point in the Levels Dialog. I > > had asked the question, is there another way to remember this x/y > > location. This is where the Sample Points Dialog was suggested to > > record the location, I think, rather than writing it down on a piece > > of paper. It's a nice idea and Dialog. > > Probably the easiest way to mark a point is to use two rulers. But sure, > the sample points can also be used for that. > > The grey-point picker in the GIMP levels tool doesn't require you to > pick a perfectly gray point though. It is totally sufficient to pick a > point that is supposed to be some shade of gray. Basically any surface > that should be white will do it. The actual luminance is not relevant.
That is very useful to know, thanks. Norman _______________________________________________ Gimp-user mailing list [email protected] https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
