Created
June 21, 2011 15:00
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Transition form bw 2 color with canvas
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>untitled</title> | |
| <style> | |
| /* Setup...not important. */ | |
| .img-wrap { | |
| width: 500px; | |
| margin: 100px auto; | |
| position: relative; | |
| cursor: pointer; | |
| } | |
| /* Handles animation of b*w to color */ | |
| canvas { | |
| position: absolute; | |
| left: 0; | |
| top: 0; | |
| opacity: 1; | |
| -webkit-transition: all 1s; | |
| -moz-transition: all 1s; | |
| -o-transition: all 1s; | |
| -ms-transition: all 1s; | |
| transition: all 1s; | |
| } | |
| canvas:hover { | |
| opacity: 0; | |
| } | |
| /* If you MUST have IE support */ | |
| #cvs-src { | |
| filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); | |
| } | |
| #cvs-src:hover { | |
| filter: none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="img-wrap"> | |
| <img id="cvs-src" src="your-image.jpg" /> | |
| <canvas width=500 height=500></canvas> | |
| </div> | |
| <script> | |
| (function() { | |
| var supportsCanvas = !!document.createElement('canvas').getContext; | |
| supportsCanvas && (window.onload = greyImages); | |
| function greyImages() { | |
| var ctx = document.getElementsByTagName("canvas")[0].getContext('2d'), | |
| img = document.getElementById("cvs-src"), | |
| imageData, px, length, i = 0, | |
| grey; | |
| ctx.drawImage(img, 0, 0); | |
| // Set 500,500 to the width and height of your image. | |
| imageData = ctx.getImageData(0, 0, 500, 500); | |
| px = imageData.data; | |
| length = px.length; | |
| for ( ; i < length; i+= 4 ) { | |
| grey = px[i] * .3 + px[i+1] * .59 + px[i+2] * .11; | |
| px[i] = px[i+1] = px[i+2] = grey; | |
| } | |
| ctx.putImageData(imageData, 0, 0); | |
| } | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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