<html>
<head>
<script type="application/javascript">
function draw(){
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var imageObj = new Image();
imageObj.src = "negro.jpg";
for (i=0; i<=500; i++){
for(j = 0; j<=500; j++){
var num = Math.random();
if(num > 0.5){
ctx.drawImage(imageObj, i, j);
}
}}
}
</script>
</head>
<body onload="draw()">
<canvas id="canvas" width="3000" height="3000"></canvas>
</body>
</html>