ABSTRACT
The Channel effects category are diffi cult to defi ne. All of the effects here deal with the channels in a layer-red, green, blur, and alpha. All of the effects here allow you to change or blend levels together, often with the channels of other layers. This is an effects category fi lled with both advanced-and obsolete effects, and their practical usage is not always obvious. I use them mostly for refl ections, but every once in a while, I come up against a problem that only the Channel effects seem to be able to solve. So, even though their use is a little more abstract, it still pays to be familiar with these tools. As a prerequisite to understanding this chapter, I strongly recommend acquiring intimate familiarity with channels, color relationships, and blend modes.
