ABSTRACT
Compositing is not the only way to blend two images together. While very appropriate for placing solid object A over solid background B, there are whole categories of other visual, atmospheric, and light phenomena that look much better with other methods of image blending. This chapter explores blending operations found in every compositing package plus some found only in Adobe Photoshop. Photoshop is used extensively in digital effects production so the equations for some of the most important blending modes unique to Photoshop are provided in a form that can be implemented in any compositing package.
