JAVA programming ?....prog. with images

Jul 12, 2001
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has anyone used the bufferedimage, raster and writableraster classes?
I am trying to manipulate the pixel values of an image, but when I try to using the method setRGB in bufferedimage it locks up if i try to just add 1 to each pixel value.

how could u use writeableraster to manipulate pixel data? or is there another method that is useful??