Adobe Photoshop 7.0 Classroom In A Book: Lesson 6 - Masks and Channels

Adobe Photoshop uses masks to isolate and manipulate specific parts of an image. A mask is like a stencil. The cutout portion of the mask can be altered, but the area surrounding the cutout is protected from change. You can create a temporary mask for one-time use, or you can save masks for repeated use...

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