The photos in question are the ones of the "culturemakers" on the the kony2012 campaign homepage - e.g. Mark Zuckerburg, Oprah etc.
I'm especially interested in how they:
- Make darker colors more prominent
- Wash out the lighter colors
- Add the checked noise to the image (it doesn't really look like another image beneath an opaque layer)
Also, I use GIMP as opposed to photoshop but hopefully I'll be able to work out any references to photoshop (or other app) anyway.