Iain
Are you looking for a how to do something type of book - if so these will all be linked to the software or is it more the teccie type of how does image manipulation work ?
Andrew
Iain
I'm afraid I can't help with that - I've never really got into the behind the scenes mathematics & programming that goes on. I'm sure that there's someone here who can help though. Good luck with your search
Andrew
Scott Kelby's 7 Point System, is pretty good, Scott takes you through step by step tutorials teaching various photoshop techniques, tools and methods, in a light and easy manner.