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Adjustment Layers

An adjustment layer differs significantly from a raster layer. Instead of adding pixels to your image, an adjustment layer seems to modify the brightness, contrast, or color of pixels on lower layers. The word “seems” is important here. No pixels on lower layers are actually changed; it only appears that they are. This is a crucial distinction, because it means that adjustment layers enable you to fine-tune your adjustment at any time, even in a later editing session (provided you save your image in PSPimage format or in another format that supports layers).

Adding an Adjustment Layer

There are nine available adjustment layers: Brightness/Contrast, Channel Mixer, Color Balance, Curves, Hue/Saturation/Lightness, Invert, Levels, Posterize, and Threshold. Each of these is entirely equivalent to the corresponding adjustment available in the Adjust menu.


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