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Many of the adjustments commonly needed to optimize an image can be done with adjustment layers. Some however necessitate duplicating your background image layer or combining multiple image layers from other sources. And as soon as you start working with more than one layer containing image pixels, the challenge of effectively combining them back together again confronts you. For this reason, Photoshop allows you to add a layer mask to an image layer. Once you have one, you can paint with shades of black and white to hide or reveal the contents of your layer just as we did last week to modify the effects of adjustment layers. The concept is the same, only the type of layer being modified differs....

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