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Chapter 11. Adjustment Layers > Limitations of Adjustment Layers

Limitations of Adjustment Layers

There is one limitation of Adjustment Layers that prevent certain adjustments from being available as an Adjustment Layer. An Adjustment Layer must be able to be fed a single pixel and figure out how it should be modified without having to rely on the information contained in the surrounding image. The Match Color, Replace Color, Shadow/Highlight, Exposure, and Equalize adjustments must be able to compare the area being adjusted to the surrounding image (or a second image) to determine how to adjust the image, which prevents them from being used as Adjustment Layers.

There are five other adjustments that are not found in the Adjustment Layers pop-up menu at the bottom of the Layers palette: Auto Levels, Auto Contrast, Auto Color, Desaturate, and Variables. These are really shortcuts for using adjustments in certain ways. You can use the following equivalents to get the same functionality in an Adjustment Layer:


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