The mathematic magic of Photoshop blend modes for image processing

Adobe Photoshop is usually the first option for most of designers and photographers when they need to process images. When they enhance their images using Photoshop, the blend modes offer incredible creative options for them. But not all of them know well about the concepts which are not always intuitive, and they are not always clear when to use what tool and how to use it effectively. This paper talks about mathematic foundation behind the blend modes. Only knows well about the ways that Photoshop processing the images, the usage of blend modes could become more and more convenient.