I would like to know how to composite a shadow in Cycles. The diffuse already has a shadow. I did the add and then multiply of the three diffuse passes. (Direct, Indirect and color) that is recommended in the official manual.
Also, I would like to know where a book can be found for compositing with Cycles. The official documentation is good, but is in small chunks. Please do not recommend the usual video tutorials. Hopefully someone can write an in depth book about professional compositing that is not about Blender Internal. Like the compositing book by the Blender Foundation when they used internal for Big Buck Bunny.