/**
 * Chromakey - Blue screen background/forground separation
 * 
 * 
 * @author Pat Troy: troy AT uic DOT edu
 */


import java.util.*;
import java.awt.*;

public class Lect1102a
{
  public static void main(String[] args)
  {
    // get the foreground picture
    String fileName = FileChooser.pickAFile();
    Picture pict = new Picture (fileName);
   
    // get the new background picture
    fileName = FileChooser.pickAFile();
    Picture pict2 = new Picture (fileName);
    
    // call a method to do the background/foreground separation
    Picture pictNew;
    pictNew = chromakey (pict, pict2);
    pictNew.show();

  }
  
  
  public static Picture chromakey (Picture p, Picture p2)
  {
    // set up the "background color"
    Color background = new Color (12, 48, 68);
    
    Pixel pix, pixNew;
    int red, green, blue, grayAmount;
    
    // set up two loops; one nested inside the other
    int xIndex, yIndex;
    
    for ( xIndex = 0 ; xIndex < p.getWidth() ;  xIndex++ )
    {
      for ( yIndex = 0 ; yIndex < p.getHeight() ; yIndex++ )
      {
        // Access the pixel from the orignal image
        pix = p.getPixel (xIndex, yIndex);
            
        // check to see if the pixel's color is not close to the background color
        if ( pix.colorDistance (background) > 45.0 )
          {
            //Access the pixl from the new background
            pixNew = p2.getPixel (xIndex, yIndex);
           
            // access the 3 color intensities
            red = pix.getRed();
            green = pix.getGreen();
            blue = pix.getBlue();

            // set the 3 color values in the new pixel
            pixNew.setRed (red);
            pixNew.setGreen (green);
            pixNew.setBlue (blue);

          }
      }
    }
    
    return ( p2 );
  }
  
}