WHITE REVEALS, BLACK CONCEALS. With this is mind the concept is easy to pick up but difficult to master. First Mask the image you want to hide (alt + Layer Mask) Then use a WHITE BRUSH (turn the opacity down to about 25 %) you can gradually paint in the image to it blends or combines with the image you are mixing it with. Flip to a BLACK BRUSH if you need to conceal any of the image.
Adjustment Layers
Very useful for making corrections and adding effects to your layers Click on any of the adjustment buttons in the adjustments panel. You can use the sliders to affect the intensity and specifics of the adjustment IMPORTANT :Click on the small icon at the bottom left of the adjustment layer panel to make sure the adjustment only affects the one layer. If you don't click this, ALL the layers will be affected by the adjustment.
MASKING AN ADJUSTMENT LAYER - click Ctrl + I This will cover your adjustment layer with a black quick mask. It will appear that the adjustments you just did are gone...but they are NOT..they are merely hidden by a mask You can then use a white paintbrush(B) to reveal any areas that you wish. This is called TARGETD EDITING( The best kind of editing : ) To toggle between a black and a white brush color tap the X key on your keyboard. Remember the rhyme, “ Black CONCEALS, White REVEALS.”