I picked up OpenGL from sample code and tutorials at the JOGL home page.
I think the Image Processing Handbook is pretty much the gold standard for image processing; I've never perused it, though. You can probably find earlier editions -or used books- for less then the current one.
It used to be that Foley/Van Dam was the standard text for computer graphics in general; not sure if that's still true.
Ping & DNS - updated with new look and Ping home screen widget