Using Selections

A selection marks off areas of the canvas for "special treatment." It can either protect an area from change or designate the area that you want to change.

You can save selections as alpha channels. This lets you store selections and edit them with brushes and image effects. For more information about alpha channels, refer to "Understanding Alpha Channels".

Having one selection, but multiple channels, is convenient and powerful. It's easy to save selections, then reactivate them later. You can also create a selection from multiple channels by adding, subtracting, or intersecting them.