​x
 
<!DOCTYPE html>
<html>
<head>
<style>
img {
  -webkit-filter: grayscale(100%); /* Chrome, Safari, Opera */
  filter: grayscale(100%);
}
</style>
</head>
<body>
​
<p>图片转为黑白色:</p>
​
<img src="/i/css3/pineapple.jpg" alt="Pineapple" width="300" height="300">
​
<p><strong>注意:</strong> Internet Explorer 或 Safari 5.1 (及更早版本) 不支持该属性。</p>
​
</body>
</html>