Opacity

To quickly change the opacity of a layer, switch to the Move tool (typing V will switch you to the Move tool), and use the number keys on your keyboard (1 = 10%, 3 = 30%, 56 = 56%, and so on).

You can figure out the exact opacity of an area by Option-clicking (Mac) or Alt-clicking (Windows) a layer's eyeball icon and then opening the Info palette. Click the eyedropper in the Info palette, and choose Opacity; you'll get a separate readout that indicates how opaque the area is below your cursor.

The Opacity setting at the top of the Layers palette controls the opacity of the active layer. When this setting is lowered, the entire layer becomes ...

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