Processing exercise: convert image to grayscale using filter()

Example to convert image to grayscale,  black and white, using filter().

Processing exercise: convert image to grayscale using filter()

PImage myImage1, myImage2;

void setup() {
  myImage1 = loadImage("http://goo.gl/MMeu0o", "png");
  myImage2 = loadImage("http://goo.gl/MMeu0o", "png");
  myImage2.filter(GRAY);
  
  size(450, 300);
  smooth();
}

void draw() {

  image(myImage1, 0, 0);
  image(myImage2, myImage1.width, 0);

}