Two of the more obvious ways to combine elements from different layers in Photoshop are: A) to erase or use a layer mask to reveal content from the layers beneath and B) to reduce a layer's opacity and make it translucent. These are powerful and ultimately straightforward techniques. But there's a third option. Photoshop's blend modes let you go far beyond what alpha-based transparency alone can do. Blend modes permit layers to transform each other's appearance.

(All photographs hail from the Fotolia image library.)
In Chapter 28, "Blend Modes Revealed," from the Photoshop CS5 One-on-One: Mastery video course on lynda.com, Deke clearly explains what blend modes do, how they work, which are the go-to modes to try first, and which ones are essentially useless. The chapter is so packed with examples and details that this article can serve only as a condensed introduction. But a rich introduction it is, packed with lots of insights and advice. Read more »
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