47/1610 Camera in Saturation

var capture; // get a live video camera

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  capture = createCapture(VIDEO); // opens up the camera

  pixelDensity(1); // turns off oversampling ("retina display")

  capture.size(320, 240); // in pixels

  capture.hide(); // telling the browser to hide the camera so we can draw it ourselves

}

​

function draw() {

  background(0);

  capture.loadPixels(); // uncompress the image to the computer's RAM and store in the pixel array

  // process image here:

  let howmanypixels = capture.pixels.length

  let rowstride = capture.width*4;

  let saturation = map(mouseX, 0, width, -5, 5);

  // chromatic (pixel-by-pixel only) processing of an image:

  for(let i = 0;i<howmanypixels;i+=4)

  {

    let r = capture.pixels[i+0];

    let g = capture.pixels[i+1];

    let b = capture.pixels[i+2];

    let lum = 0.2126*r + 0.7152*g + 0.0722*b; // luminosity formula

    capture.pixels[i+0] = lum + (r-lum)*saturation;

    capture.pixels[i+1] = lum + (g-lum)*saturation;

    capture.pixels[i+2] = lum + (b-lum)*saturation;

  }

  capture.updatePixels(); // puts the modified pixel array back and xfers it to the GPU

  noSmooth();

  image(capture, 0, 0, width, height);

}