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Change brightness/contrast for part of image

Oct 27, 2012, 17:56
Post: #1
Change brightness/contrast for part of image
I am able to change the brightness/contrast for part of an image by using, for example, the Rectangle Select tool. I want to be a little trickier though. I would like to use the rectangle select tool, but have the effect of the brightness/contrast apply 100% at the bottom of the rectangle and say 10% at the top, with gradations from 100 to 10 from bottom to top. Is this possible?
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Oct 28, 2012, 15:21 (This post was last modified: Oct 28, 2012 15:21 by allelopath.)
Post: #2
RE: Change brightness/contrast for part of image
Thanks for your monster reply.

I was following Method 1 and I screwed something up. The b&w gradients had looked as you would expect (black -> white) but now they are all white.
   
How can I get these back to normal?

GIMP 2.8.0
OS X
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