Get binary from image

Question

I'm trying to get the binary pattern from an image and store it byte by byte, so i can manipulate it.
Any help on how i would go about doing this would be greatfully recieved.
Perhaps a url to some relevant material would be nice. Thought I'd come to the guys who know about this sort of thing.
Thanks
Fraser

Answer 1

try {
            int[] pixels = new int[width * height];
            PixelGrabber pg = new PixelGrabber(img, 0, 0, width, height, pixels, 0, width);
            pg.grabPixels();
            return pixels;
        } catch (InterruptedException ie) { return null; }This code is an example using a pixel grabber to retrieve an array of int values, each representing pixel data.
int values are 32 bit, but the pixel data should only encompass the first 8 bits of each int.
You can't cast the int to a byte because it will chop off the bits from the other end leaving you with a byte full of 0's and a black image.
To convert these ints to bytes you can use bitwise operators to chop off the leading 0 bits and then build a byte array with your image data.