Editing And Modifying Selection Masks Tutorials
Very rarely is a new selection perfect. Invariably, you have to do some work on it before you can use it. Fortunately, after you have stored the selection in an alpha channel, you can modify it in a number of ways. You can use painting tools, transform commands, or filters to modify the alpha channel and then load it as a selection mask. Using Painting Tools and Filters Because selection masks are composed of grayscale images, you can use only black and white paint, or shades of the two, to modify a mask. When you activate an alpha channel containing a selection that you wish to modify, the foreground and background colors are automatically set to white and black , respectively. However, when you enter Quick Mask mode (Q), the foreground and background colors are set to black and white , respectively. Painting with black in the alpha channel expands the masked areas and contracts the selected areas; painting with white has the opposite effect: masked areas contract and selected a...