topical media & game development

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graphic-processing-site-examples-Topics-Image-Processing-Brightness-Brightness.pde / pde



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

  
   
  PImage img;
  
  void setup() {
    size(200, 200);
    frameRate(30);
    img = loadImage("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();
  }
  


(C) Æliens 20/2/2008

You may not copy or print any of this material without explicit permission of the author or the publisher. In case of other copyright issues, contact the author.