Alpha Mask
/**
* Alpha Mask.
*
* Loads a "mask" for an image to specify the transparency
* in different parts of the image. The two images are blended
* together using the mask() method of PImage.
*/
PImage* img;
PImage* imgMask;
void setup() {
size(640, 360);
img = loadImage("moonwalk.jpg");
imgMask = loadImage("mask.jpg");
img->mask(*imgMask); // dereference because mask takes const PImage&
imageMode(CENTER);
}
void draw() {
background(0, 102, 153);
image(img, width / 2, height / 2);
image(img, mouseX, mouseY);
}