Layer operations explanation?

Does anyone know of a site/book which describes how layer operations such as add, screen etc works? I know the basics, but I was more thinking of Photoshop operations such as:
Hard Light
Soft Light

etc.. I know you can use the multilayer node in Shake for those but how do they work if I want to do it manually with nodes inside Shake?

The ColorX is for doing things like this I guess, but can you do it without, using IAdd, clamp and other things because I’ve heard the ColorX is quite slow.

For instance, how does the Soft Light work?

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