RGB? CMYK? Alpha? What Are Image Channels and What Do They Mean?

The channels panel in Photoshop is one of the most disused and misunderstood parts of the program. But images have color channels with or without Photoshop. Read on to find out what color channels are, what RGB and CMYK are, and learn a little bit more about how image files work.


Link : http://goo.gl/5vMkU