canvas 改变图片色彩
canvas 改变图片颜色
<!DOCTYPE html>
<!-- to moving elements in a straight line -->
<html>
<head>
<meta charset='utf-8'/>
<script type="text/javascript">
window.addEventListener('load',canvasApp, false);
function canvasApp(args) {
var canvas = document.getElementById("MyCanvas");
var context = canvas.getContext("2d");
var logoL = new Image();
logoL.src= "../img/csrLeft.png";
var widthL = 88;
var logoR = new Image();
logoR.src = "../img/csrRight.png";
var widthR = 286;
var height = 31;
context.drawImage(logoL,0,0);
var dataL = context.getImageData(0,0,widthL,height);
for (var i=0; i<dataL.data.length; i+=4 ) {
dataL.data[i] = 29;
dataL.data[i+1] = 58;