#javascript-processing-example-topic-image-brightness.htm / htm
<!DOCTYPE html> <html><head> <script src="javascript-processing-example-processing.js"></script> <script src="javascript-processing-example-init.js"></script> <link rel="stylesheet" href="javascript-processing-example-style.css"> </head><body><h1><a href="http://ejohn.org/blog/processingjs/">Processing.js</a></h1> <h2>Brightness</h2> <p>by Daniel Shiffman. Adjusts the brightness of part of the image Pixels closer to the mouse will appear brighter.</p> <p><a href="http://processing.org/learning/topics/brightness.html"><b>Original Processing.org Example:</b> Brightness</a><br> <script type="application/processing"> PImage img; void setup() { size(33, 33); frameRate(30); img = loadImage("cait.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 = 15;//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(); } </script><canvas width="33" height="33"></canvas></p> <div style="overflow: hidden; height: 0px; width: 0px;"><img src="javascript-processing-example-cait.jpg" id="cait.jpg"></div> <pre><b>// All Examples Written by <a href="http://reas.com/">Casey Reas</a> and <a href="http://benfry.com/">Ben Fry</a> // unless otherwise stated.</b> 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(); }</pre> </body></html>
(C) Æliens 20/2/2008
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