Hi!
I've been running in circles for 2 days now trying to get a radial gradiant on an ellipse mask over my image. I'd like it to look like daniel shiffman's Brigthness example except I don't want to change to pixels of my image below. I'm still pretty new at processing. Anyone help please? here's the code I'm working on below (from paul), Thanks for your help:

PGraphics pg;
PImage img;

void setup() {
  size(400, 580);
  pg = createGraphics(400, 580, P2D);
  img = loadImage("second-suspect.jpg");
}

void draw() {
  smooth();
 
  pg.beginDraw();
  pg.background(0);
  pg.strokeWeight(10);
  pg.fill(255);
  pg.ellipse(mouseX, mouseY, 200, 200);
  pg.endDraw();

  background(0);
  img.mask(pg);
//  img.blend(pg, mouseX, mouseY, width, height, mouseX, mouseY-150, 30, 30, MULTIPLY);
  image(img, 0, 0);
}