Before and After Views
If your document contains multiple Adjustment Layers, and you want to view the original, unadjusted image, you'll have to hide all the Adjustment Layers by clicking their eyeball icons. To see the result of your adjustments, make the Adjustment Layers visible by clicking the eyeball icons again. All that eyeball clicking makes it difficult to get a quick before and after view of your image. To solve this problem, hold Option (Mac) or Alt (Windows) and click on the eyeball icon for the Background layer (or whichever layer contains the original image). That will hide all the layers except the one you're clicking on. Just repeat the process to toggle all the hidden layers so they come back into view.
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