Adobe Photoshop CS5 Classroom in a Book by Adobe Creative Team

Author:Adobe Creative Team
Language: eng
Format: mobi, pdf
Publisher: Adobe Press
Published: 2010-05-26T16:00:00+00:00

• An alpha channel—also called a mask or selection—is an extra channel added to an image; it stores selections as grayscale images. You can add alpha channels to create and store masks.

• A layer mask is like an alpha channel, but it’s attached to a specific layer. A layer mask controls which part of a layer is revealed or hidden. It appears as a blank thumbnail next to the layer thumbnail in the Layers panel until you add content to it; a black outline indicates that it’s selected.

• A vector mask is essentially a layer mask made up of vectors, not pixels. Resolution-independent, vector masks have crisp edges and are created with the pen or shape tools. They don’t support transparency, so their edges can’t be feathered. Their thumbnails appear the same as layer mask thumbnails.

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