green channel extraction

[sarah49]

i'm trying to mask non-green and alpha channels from images. The following code worked for single image but when i tried working for multiple images i get a black image as output, instead of green. Can anyone help me?

public class green 
{
  private Vector<Integer> w = null;
  private Vector<Integer> h = null;
  private int pixelCol;
  private BufferedImage[] g=null;
  public BufferedImage[] MaskNongreen(BufferedImage bi[]) // input images array
  {
    w = new Vector<Integer>();
    h = new Vector<Integer>();
    g=new BufferedImage[bi.length];
 
    for(int i=0;i<bi.length;i++)
    { 
       w.add(bi[i].getWidth());
       h.add(bi[i].getHeight());
       g[i]=new BufferedImage(w.get(i),h.get(i),bi[i].getType());
     
       for (int x=0; x < w.size(); x++)
       {
       for (int y = 0; y <h.size(); y++)
       {     
        pixelCol=bi[i].getRGB(x,y);      
        pixelCol &= 0x0FF00FF00; //masks nongreen and alpha
        g[i].setRGB(x, y, pixelCol);
       }
      }
    }
   return g;
  }
 }

[sarah49]

made a silly mistake in for loop.It works fine now