import gab.opencv.*;

OpenCV opencv;
PImage  before, after, grayDiff;
//PImage colorDiff;
void setup() {
  before = loadImage("before.jpg");
  after = loadImage("after.jpg");
  size(before.width, before.height);

  opencv = new OpenCV(this, before);    
  opencv.diff(after);
  grayDiff = opencv.getSnapshot(); 

//  opencv.useColor();
//  opencv.loadImage(after);
//  opencv.diff(after);
//  colorDiff = opencv.getSnapshot();
 
}

void draw() {
  pushMatrix();
  scale(0.5);
  image(before, 0, 0);
  image(after, before.width, 0);
//  image(colorDiff, 0, before.height);
  image(grayDiff, before.width, before.height);
  popMatrix();

  fill(255);
  text("before", 10, 20);
  text("after", before.width/2 +10, 20);
  text("gray diff", before.width/2 + 10, before.height/2+ 20);

//  text("color diff", 10, before.height/2+ 20);
}