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TintImage.html
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<!doctype html>
<!-- paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/ -->
<!--[if lt IE 7]> <html class="no-js ie6 oldie" lang="en"> <![endif]-->
<!--[if IE 7]> <html class="no-js ie7 oldie" lang="en"> <![endif]-->
<!--[if IE 8]> <html class="no-js ie8 oldie" lang="en"> <![endif]-->
<!-- Consider adding an manifest.appcache: h5bp.com/d/Offline -->
<!--[if gt IE 8]><!--> <html class="no-js" lang="en"> <!--<![endif]-->
<head>
<meta charset="utf-8">
<!-- Use the .htaccess and remove these lines to avoid edge case issues.
More info: h5bp.com/b/378 -->
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title></title>
<meta name="description" content="">
<meta name="author" content="">
<!-- Mobile viewport optimized: j.mp/bplateviewport -->
<meta name="viewport" content="width=device-width,initial-scale=1">
<!-- Place favicon.ico and apple-touch-icon.png in the root directory: mathiasbynens.be/notes/touch-icons -->
<!-- CSS: implied media=all -->
<!-- CSS concatenated and minified via ant build script-->
<link rel="stylesheet" href="css/style.css">
<!-- end CSS-->
<!-- More ideas for your <head> here: h5bp.com/d/head-Tips -->
<!-- All JavaScript at the bottom, except for Modernizr / Respond.
Modernizr enables HTML5 elements & feature detects; Respond is a polyfill for min/max-width CSS3 Media Queries
For optimal performance, use a custom Modernizr build: www.modernizr.com/download/ -->
<script src="js/libs/modernizr-2.0.6.min.js"></script>
<script>
var canvas;
function tintImage(imgElement,tintColor) {
// create hidden canvas (using image dimensions)
canvas = document.createElement("canvas");
canvas.width = imgElement.offsetWidth;
canvas.height = imgElement.offsetHeight;
var ctx = canvas.getContext("2d");
ctx.drawImage(imgElement,0,0);
var map = ctx.getImageData(0,0,320,240);
var imdata = map.data;
// convert image to grayscale
var r,g,b,avg;
for(var p = 0, len = imdata.length; p < len; p+=4) {
r = imdata[p]
g = imdata[p+1];
b = imdata[p+2];
avg = Math.floor((r+g+b)/3);
imdata[p] = imdata[p+1] = imdata[p+2] = avg;
}
ctx.putImageData(map,0,0);
// overlay filled rectangle using lighter composition
ctx.globalCompositeOperation = "lighter";
ctx.globalAlpha = 0.5;
ctx.fillStyle=tintColor;
ctx.fillRect(0,0,canvas.width,canvas.height);
// replace image source with canvas data
imgElement.src = canvas.toDataURL();
}
function reset(imgElement)
{
// var context = imgElement.getContext("2d");
// context.clearRect(0,0,canvas.width,canvas.height);
// reset image source with url
imgElement.src = "img/vr/5th_ave_1.jpg";
}
</script>
</head>
<body>
<div id="container">
<header>
</header>
<div id="main" role="main">
<img id="myImage" src="img/vr/5th_ave_1.jpg"/>
<button type="button" onclick="tintImage(document.getElementById('myImage'),'#550000')">RED</button>
<button type="button" onclick="tintImage(document.getElementById('myImage'),'#000055')">BLUE</button>
<button type="button" onclick="reset(document.getElementById('myImage'))">RESET</button>
</div>
<footer>
</footer>
</div> <!--! end of #container -->
<!-- JavaScript at the bottom for fast page loading -->
<!-- Grab Google CDN's jQuery, with a protocol relative URL; fall back to local if offline -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
<script>window.jQuery || document.write('<script src="js/libs/jquery-1.6.2.min.js"><\/script>')</script>
<!-- scripts concatenated and minified via ant build script-->
<script defer src="js/plugins.js"></script>
<script defer src="js/script.js"></script>
<!-- end scripts-->
<!-- Change UA-XXXXX-X to be your site's ID -->
<script>
window._gaq = [['_setAccount','UAXXXXXXXX1'],['_trackPageview'],['_trackPageLoadTime']];
Modernizr.load({
load: ('https:' == location.protocol ? '//ssl' : '//www') + '.google-analytics.com/ga.js'
});
</script>
<!-- Prompt IE 6 users to install Chrome Frame. Remove this if you want to support IE 6.
chromium.org/developers/how-tos/chrome-frame-getting-started -->
<!--[if lt IE 7 ]>
<script src="//ajax.googleapis.com/ajax/libs/chrome-frame/1.0.3/CFInstall.min.js"></script>
<script>window.attachEvent('onload',function(){CFInstall.check({mode:'overlay'})})</script>
<![endif]-->
</body>
</html>