Photoshop’s blend modes are incredibly powerful, but their documentation is somewhat sparse, and most people use only a fraction of their power, I would bet. Photographer Robert Thomas fills in the gaps with this incredibly detailed look at how blend modes work, explaining how to manipulate blend layers through obscure keyboard shortcuts that I had no idea were available (and I use a ton of keyboard shortcuts in Photoshop), as well as diving into the actual mathematical operations that drives each mode. It’s probably more in-depth than most users have need for, but in those cases when a deeper understanding of how these features work, this is remarkable. Read all about them here.
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