[Java]Unbekannter Farbcode

import java.awt.*;
import java.awt.image.*;

public class Pixel3
{
	public static void main(String[] args) throws AWTException
	{
		long start = System.currentTimeMillis();//timestamp
		Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
		try 
		{
			Robot rb = new Robot();
			Rectangle screenRect = new Rectangle(dim);
			BufferedImage bimage = rb.createScreenCapture(screenRect);
			int w = bimage.getWidth(null);
			int h = bimage.getHeight(null);
			int[] rgbs = new int[w * h];
			int[] a = bimage.getRGB(0, 0, w, h, rgbs, 0, w);
			// Ab hier Wird das Array Durchsucht
			for(int i=0;i<a.length;i++)
			{
				if (a[i] == -16711936)//Hier ist der unbekannte Farbcode
				{
					int pointy = (int)((i+1)/w);
					int pointx = (i)-(pointy*w);
					System.out.println(pointx + " " + pointy);
					break;
				}
			}
		} catch (Exception e)
		{
		}
		long stop = System.currentTimeMillis();//timestamp
		System.out.println((stop - start) + " Millisekunden.");//timestamp printout		
	}
 }