Getting Pixel values from a RenderedOP

Question

Hi,
I'm trying to run thru the pixels of finalmage :
RenderedOp finalImage = JAI.create("subtract",pbSubtracted);
and add the the pixels x and y to an array if the colour of the pixel isnt black, what shud i be using, i tried setting it up as a buffered image and using getRGB, but returns alot of -11666667E17 numbers, getColor doesnt work, and getPixel requires someother workings i presume?
any help much appreciated

Answer 1

A new BufferedImage is all black until you draw in it.
import java.awt.Color;
class Test
    public static void main(String[] args)
        int value = -16777216;
        Color color = new Color(value);
        System.out.println("color = " + color.toString() + "\n" +
                           "red   = " + color.getRed());
        int a = (value >> 24) & 0xff;
        int r = (value >> 16) & 0xff;
        int g = (value >>  8) & 0xff;
        int b = (value >>  0) & 0xff;
        System.out.println("a = " + a + "\n" +
                           "r = " + r + "\n" +
                           "g = " + g + "\n" +
                           "b = " + b);
}