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actions

Preset scripts that automate repetitive tasks. With just a single mouse click, you can create special effects without having a clue as to how they are done.

adjustment layer

A color-correction layer that allows you to adjust the tone or color in an image without altering the content of the layers beneath it.

alias

The name for the jagged edges ("jaggies") that are seen when an image doesn't contain enough information to make a smooth transition on angled or rounded edges. Also called stair-stepping because the edge may look like a series of steps.

alpha channel

The "layer" in which you can save a selection.

anti-aliasing

The method of reducing jagged edges in an image or text by slightly blurring the edges of shapes and text to make them appear smooth.