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(12-28-2018, 07:04 AM)Ofnuts Wrote: [ -> ]Looking at your picture, i think the right way to do it is to use  luminosity mask.

Thanks ofnuts -- while such a masking technique may be useful for this particular image, what I was after was a technique that allowed me to use the regular gradient tool.

I suspect, given that neither you nor rich2005 know of such a thing and given your combined expertise in GIMP, that this is not an easy thing to do.

Actually I made a post with that technique, but deleted it because I thought it was too complicated. Now restored as post #3 in this thread.

But the easiest technique IMHO is to use a blur, whic is the equivalent of a linear gradient. If you want to change that gradient, remember that you can apply Levels or Curves to the mask.

ofnuts - thanks again - I think you and rich2005 have both provided a very similar approach. Am digesting what they mean and steps to duplicate.