a port of the Processing Visualization Language

Brightness

by Daniel Shiffman. Adjusts the brightness of part of the image Pixels closer to the mouse will appear brighter.

Original Processing.org Example: Brightness

// All Examples Written by Casey Reas and Ben Fry

// unless otherwise stated.

/* @pjs preload="data/wires.jpg"; */

PImage img;



void setup() {

  size(200, 200);

  frameRate(30);

  img = loadImage("data/wires.jpg");

}



void draw() {

  loadPixels();

  for (int x = 0; x < img.width; x++) {

    for (int y = 0; y < img.height; y++ ) {

      // Calculate the 1D location from a 2D grid

      int loc = x + y*img.width;

      // Get the R,G,B values from image

      float r,g,b;

      r = red (img.pixels[loc]);

      //g = green (img.pixels[loc]);

      //b = blue (img.pixels[loc]);

      // Calculate an amount to change brightness based on proximity to the mouse

      float maxdist = 50;//dist(0,0,width,height);

      float d = dist(x,y,mouseX,mouseY);

      float adjustbrightness = 255*(maxdist-d)/maxdist;

      r += adjustbrightness;

      //g += adjustbrightness;

      //b += adjustbrightness;

      // Constrain RGB to make sure they are within 0-255 color range

      r = constrain(r,0,255);

      //g = constrain(g,0,255);

      //b = constrain(b,0,255);

      // Make a new color and set pixel in the window

      //color c = color(r,g,b);

      color c = color(r);

      pixels[loc] = c;

    }

  }

  updatePixels();

}
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