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<!DOCTYPE html> <html> <body> <img id="scream" src="img_the_scream.jpg" alt="The Scream" width="220" height="277"> <canvas id="myCanvas" width="220" height="277" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.</canvas> <script> document.getElementById("scream").onload = function() { var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); var img = document.getElementById("scream"); ctx.drawImage(img, 0, 0); var imgData = ctx.getImageData(0, 0, c.width, c.height); // invert colors var i; for (i = 0; i < imgData.data.length; i += 4) { imgData.data[i] = 255 - imgData.data[i]; imgData.data[i+1] = 255 - imgData.data[i+1]; imgData.data[i+2] = 255 - imgData.data[i+2]; imgData.data[i+3] = 255; } ctx.putImageData(imgData, 0, 0); }; </script> </body> <!-- Mirrored from www.w3schools.com/tags/tryit.asp?filename=tryhtml5_canvas_getimagedata2 by HTTrack Website Copier/3.x [XR&CO'2014], Fri, 23 Jan 2015 08:09:44 GMT --> </html>
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