Lynda.com today introduced “Photoshop CS3 Channels and Masks: The Essentials.” 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. Subscriptions to the lynda.com Online Training Library start at US$25.