<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
#myCanvas {
border: 10px solid red;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="600" height="600"></canvas>
</body>
<script type="text/javascript">
var myCanvas = document.getElementById("myCanvas");
var context = myCanvas.getContext("2d");
var imgObj = new Image();
imgObj.src = "AKL.jpg";
imgObj.onload = function() {
context.drawImage(imgObj, 0, 0);
var imgData = context.getImageData(0,0,myCanvas.width,myCanvas.height);
var pixels = imgData.data;
//获取每个像素点的rgb
for(var i=0;i<pixels.length;i+=4){
var r=pixels[i];
var g=pixels[i+1];
var b=pixels[i+2];
//灰度
// var gray = (r+g+b)/3;
// pixels[i]=gray;
// pixels[i+1]=gray;
// pixels[i+2]=gray;
//反色
pixels[i]=255-r;
pixels[i+1]=255-g;
pixels[i+2]=255-b;
}
context.putImageData(imgData,100,100);
}
</script>
</html>
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