Help with exposure in Photoshop

trial_07

Play with gravity
~SPONSOR~
Apr 26, 2004
1,430
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Hey guys!
I picked out this guide on how to fix exposure with layers and mask and I am not able to do step 7.
http://www.tutorialelf.com/photoshop/7/layer-mask-essentials_2.html
When I paint over the background in white, it does not reveal the darker layer. It's like if I was painting with transparent paint. I done and re-done the steps and I just can't figure it out.
Your help is appreciated!
 
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