[Brian Garber] "After Effects has an Add blending mode, photoshop does not. Why is that?"
In Photoshop, it's called Linear Dodge (Add).
See John Nack's blog post (and the comments) for some more detail on
linear dodge.
Walter Soyka
Principal & Designer at
Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events