¶Expressions for Photoshop blending modes

Just a quickie this time.

A while ago, I went hunting around for the expressions needed to implement Photoshop's layer blending modes. The basic ones like Lighter Color and Screen are easy to find or discern, but some of the lighting modes are harder to do. The best reference I've found so far is from a PDF blend mode addendum on Adobe's site:

http://www.adobe.com/devnet/pdf/pdf_reference_archive.html
http://www.adobe.com/content/dam/Adobe/en/devnet/pdf/pdfs/pdf_reference_archives/blend_modes.pdf

It doesn't cover some of the more obscure modes like Vivid Light, but it notably covers the complex Soft Light algorithm and the HSL modes.

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