image filters - OpenProcessing

mySketch
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PImage img;
int tick;
​
void setup() {
  size(2560, 1440);
  background(0, 0, 20);
  imageMode(CENTER);
  img = loadImage("iridescence.jpg");
​
  loadPixels();
}
​
void draw() {
  background(0, 0, 20);
  //image(img, width / 2, height / 2, 640 + sin(tick / 25) * 10, 360 + sin(tick / 25) * 10);
  if (img.width == 0) {
    return;
  }
​
  for (int y = 0; y < img.height; y++) {
    for (int x = 0; x < img.width; x++) {
      int loc = x + y * img.width;
​
      color pixC = img.pixels[loc];
​
      float r = red(pixC);
      float g = green(pixC);
      float b = blue(pixC);
​
      if (keyPressed) {
        if (key == '1') {
          r = 255 - r;
        }
        if (key == '2') {
          g = 255 - g;
        }
        if (key == '3') {
          b = 255 - b;
        }
        if (key == '4') {
          r = g = b
        }
        if (key == '5') {
          r = 0;
        }
        if (key == '6') {
          g = 0;
        }
        if (key == '8') {
          b = 0;
        }
        if (key == '9') {
          if (r + g + b < 200 || r + g + b > 350) {
            r = 255;
            g = 255;
            b = 255;
          } else {
            r = 0;
            g = 0;
            b = 0;
          }
        }
        if (key == '0') {
          r = (x / 20) + r;
          g = (x / 10) + g;
        }
        if (key == 'q') {
          tr = r;
          tg = g;
          tb = b;
          r = (tg / tb) * 100;
          g = (tr / tb) * 100;
          b = (tr / tg) * 100;
        }
        if (key == 'w') {
          r += sin(x) * 50;
          g += sin((x + y) / 2) * 50;
          b += sin(y) * 50;
        }
      }
​
      pixCN = color(r, g, b);
​
      pixels[loc] = pixCN;
    }
  }
  tick++;
  updatePixels();
}