pictureaddition

pictureaddition.pde

PImage picture1;
PImage picture2;

void setup() {
  size(600, 400);
  picture1 = loadImage("color.jpg");
  picture2 = loadImage("watch.jpg");

  // resize them
  picture1.resize(width, height);
  picture2.resize(width, height);

  frameRate(0.5);
}

final int WAITTIME = 2000;
int actualMethod = -1;

void draw(){
  actualMethod = (++actualMethod) % 3;
  
  String method = "";
  
  switch(actualMethod){
    case 0:
      image(imgAddition(picture1, picture2, 0.3), 0, 0);
      method = "ADD";
      break;
    case 1:
      image(imgSubtraction(picture1, picture2, 0.3), 0, 0);
      method = "SUBTRACT";
      break;
    case 2:
      image(imgMultiply(picture1, picture2, 1), 0, 0);
      method = "MULTIPLY";
      break;
  }
  
  fill(0, 0, 0);
  text("Method: " + method, 5, 20);
}

PImage imgAddition(PImage img1, PImage img2, float factor) {
  PImage result = new PImage(width, height);
  for (int x = 0; x < width; x = x + 1) {
    for (int y = 0; y < height; y = y + 1) {
      color col1 = img1.get(x, y);
      color col2 = img2.get(x, y);
      int r = (int)min((red(col1)*factor + red(col2)), 255);
      int g = (int)min((green(col1)*factor + green(col2)), 255);
      int b = (int)min((blue(col1)*factor + blue(col2)), 255);
      result.set(x, y, color(r, g, b));
    }
  }
  return result;
}

PImage imgSubtraction(PImage img1, PImage img2, float factor) {
  PImage result = new PImage(width, height);
  for (int x = 0; x < width; x = x + 1) {
    for (int y = 0; y < height; y = y + 1) {
      color col1 = img1.get(x, y);
      color col2 = img2.get(x, y);
      int r = (int)max((red(col2) - red(col1)*factor), 0);
      int g = (int)max((green(col2) - green(col1)*factor), 0);
      int b = (int)max((blue(col2) - blue(col1)*factor), 0);
      result.set(x, y, color(r, g, b));
    }
  }
  return result;
}

PImage imgMultiply(PImage img1, PImage img2, float factor) {
  PImage result = new PImage(width, height);
  for (int x = 0; x < width; x = x + 1) {
    for (int y = 0; y < height; y = y + 1) {
      color col1 = img1.get(x, y);
      color col2 = img2.get(x, y);
      int r = (int)max((red(col2) + red(col1) * factor) / 2, 0);
      int g = (int)max((green(col2) + green(col1) * factor) / 2, 0);
      int b = (int)max((blue(col2) + blue(col1) * factor) / 2, 0);
      result.set(x, y, color(r, g, b));
    }
  }
  return result;
}