Alpha channels are collections of luminance data that control the transparency of images, and they influence just about everything in Photoshop. Coming to terms with alpha channels, also known as masks, is a surefire way to maximize results. Omni Award-winning Photoshop expert Deke McClelland leaves no pixel unturned as he explores Refine Edge, Color Range, the Channels palette, the Quick Mask mode, channel masking, blend modes, and more. After watching Photoshop CS3 Channel and Masks: The Essentials, even the most complex techniques will seem like child's play. Exercise files accompany the tutorials.
Download Deke's customized keyboard layouts for Channels and Masks from the Exercise Files tab."