SOURCE

<h2>原始图像</h2>
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/123941/sports-q-c-1000-600-3.jpg">

<h2><code>亮度(80%)</code> | <code>亮度(150%)</code></h2>
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/123941/sports-q-c-1000-600-3.jpg">
<img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/123941/sports-q-c-1000-600-3.jpg">

* {
   margin: 0;
   padding: 0;
   box-sizing: border-box;
 }
 
 body {
   text-align: center;
   margin: 20px auto;
 }
 
 h2 {
   margin: 20px;
   padding-top: 20px;
   clear: both;
 }
 
 img {
   max-width: 50%;
   margin: 0 auto;
   padding: 2px;
 }
 
 img:nth-of-type(2) {
   -webkit-filter: brightness(80%);
   filter: brightness(80%);
 }
 
 img:nth-of-type(3) {
   -webkit-filter: brightness(150%);
   filter: brightness(150%);
 }
 
 img:nth-of-type(1) {
   width: 100%;
 }