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Creating an adjustment layer adds a new layer to your Layers panel with a little icon, so you know which adjustment you applied (you can see the little Curves icon in the next step).

In the pop-up menu that appears, choose the adjustment you want (I chose Curves here), and the Properties panel appears, with that adjustment’s options (as seen here on the right). To see the adjustments you can apply as adjustment layers, click on the Create New Adjustment Layer icon (the half white/half black circle) at the bottom of the Layers panel. So, if you reopen that same document a week or a year later, you can still edit or even completely undo those tonal changes. Think about this: You have a certain amount of undos while you’re working in Photoshop, right? But, what happens when you close that document and reopen it later? Those undos are gone, right? Well, that’s just one of the benefits of these non-destructive adjustment layers-you can use them as undos that last forever. The Adobe Photoshop Book for Digital Photographers, 2nd EditionĪdjustment layers allow you to not only have an “undo” for any tonal adjustments you make (like brightening or darkening your image, or adding contrast, etc.), but they also give you the ability to edit those things forever.
