pythonScript/canvasImage.html at master · SmoothLatte/pythonScript · GitHub

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<title>canvas图像处理</title>
</head>
<body>
	<h1>canvas</h1>
	<canvas id="canvas1" width="400" height="320">是时候更换浏览器了<ahref="http://firefox.com.cn/download/">点击下载firefox</a></canvas>
	<script>
		var canvas1=document.getElementById('canvas1');
		var context1=canvas1.getContext('2d');
		var image=new Image();
		image.src="z.jpg";
		image.onload=function(){
			context1.drawImage(image,0,0);//绘制原始图像，（0,0）表示图像的左上角位与canvas画布的位置
		}
		function draw()
		{
			imagedata = context1.getImageData(0,0,image.width,image.height);
			var imgedate1 = context1.createImageData(image.width,image.height);
			for(var j=0;j<image.height;j+=1)
			{
				for(var i=0;i<image.width;i+=1){
					k=4*(image.width*j+i);
					imagedata1.data[k+0]=255-imagedata.data[k+0];
					imagedata1.data[k+1]=255-imagedata.data[k+1];
					imagedata1.data[k+2]=255-imagedata.data[k+2];
					imagedata1.data[k+3]=255;
				}
			}
			context1.putImageData(imagedata1,0,0);
		}
	</script>
	<br/>
	<button onclick="draw()">图像的反转</button>
	<br/>
	<!--
	<canvas id="canvas2" width="400" height="320"></canvas>
	<script>
		function draw(){
			var canvas2=document.getElementById('canvas1');
			var context2=canvas2.getContext('2d');
			var imagedata=context1.getImageData(0,0,image.width,image.height);
			var imagedata1=context2.createImageData(image.width,image.height);
			for(var j=0;j<image.height;j+=1)
				for(var i=0;i<image.width;i+=1){
					k=4*(image.width*j+i);
					imagedata1.data[k+0]=255-imagedata.data[k+0];
					imagedata1.data[k+1]=255-imagedata.data[k+1];
					imagedata1.data[k+2]=255-imagedata.data[k+2];
					imagedata1.data[k+3]=255;
				}
			context2.putImageData(imagedata1,0,0);
		}
	</script>-->
</body>
</html>