Chromakey lab

public Picture chromakey(Picture newBg)
{
   Pixel currPixel=null;
   Pixel newPixel=null;
   Pixel canvas=null;
   Picture result = new Picture(this.getWidth(),this.getHeight());
   for(int x=0; x<getWidth();x++)
   {
      for(int y=0; y<getHeight();y++)
      {
            newPixel=newBg.getPixel(x,y);
            canvas=result.getPixel(x,y);
            canvas.setColor(newPixel.getColor());
            currPixel=this.getPixel(x,y);
        if(currPixel.getRed()+currPixel.getGreen()>currPixel.getBlue())
         {
            canvas.setColor(currPixel.getColor());
         }
      }
   }
   return result;

}