This exact same technique of representing selection and masking as an overlayed colour is also used in Photoshop’s QuickMask mode. To enter QuickMask mode, click on the QuickMask icon on the toolbar or just press the letter andquot;qandquot; on the keyboard. Once in QuickMask mode, all of Photoshop’s paint tools, such as the paintbrush and gradient, can be used to make selections. Selections are represented in pretty much the same way as they are on alpha channels. In fact, if you look at the Channels window when in QuickMask mode, you will notice that Photoshop has created a temporary alpha channel called andquot;QuickMaskandquot; which will disappear as soon as you exit QuickMask mode.