Java4k and beyond

Hello everybody, I just have problems figuring out pixel by pixel manupulations. I’ve heard of tutorials from ahristov from this thread http://www.java-gaming.org/topics/tutorial-time-sources/16439/view.html but seems like its been down for quite a while. I tried to read the source code myself, but for thye beginner it looks like a mess without comments. I would like to know how binary operations are involved in color manipulations and all. Thank you all in advance.