Chapter 2. Work with Layers, Selections, and Masks
Layers, selections, and masks are the key to using Photoshop for any photographic or design projects. You may simply duplicate a layer as a safety step or build a complex multilayered image combining layers and layer effects with selections and masks.
A layer is similar to a transparency sheet with or without an image on it. You can edit, transform, or add filters to a layer independently from other layers. You can make one layer alter the look of a layer above or below it. You can flatten all the layers to finalize an image or save a file with the layers for future editing. You can also drag a layer from one document to another.
Selections enable you to isolate areas in your image and apply different ...