css 里面，有一个属性filter，可以直接产生滤镜效果，大家感兴趣的话可以试一试
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>filter</title>
<style>
/*
grayscale 灰度 值为0-1之间的小数
sepia 褐色 值为0-1之间的小数
saturate 饱和度 值为num
hue-rotate 色相旋转 值为angle
invert 反色 值为0-1之间的小数
opacity 透明度 值为0-1之间的小数
brightness 亮度 值为0-1之间的小数
contrast 对比度 值为num
blur 模糊 值为length
drop-shadow 阴影
*/
.both{
width: 350px;
padding: 10px;
box-sizing:border-box;
margin: auto;
}
.both img{
width: 100%;
height: auto;
}
.grayscale img{ /*黑白色*/
filter:grayscale(100%);
-webkit-filter: grayscale(100%);
-moz-filter: grayscale(100%);
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
}
.sepia img{ /*复古褐色*/
filter:sepia(100%);
-webkit-filter: sepia(100%);
-moz-filter: sepia(100%);
-ms-filter: sepia(100%);
-o-filter: sepia(100%);
}
.saturate img{ /*饱和度*/
filter:saturate(80);
-webkit-filter: saturate(80);
-moz-filter: saturate(80);
-ms-filter: saturate(80);
-o-filter: saturate(80);
}
.hue-rotate img{ /*色相*/
filter:hue-rotate(330deg);
-webkit-filter: hue-rotate(330deg);
-moz-filter: hue-rotate(330deg);
-ms-filter: hue-rotate(330deg);
-o-filter: hue-rotate(330deg);
}
.invert img{ /*反色*/
filter:invert(1);
-webkit-filter: invert(1);
-moz-filter: invert(1);
-ms-filter: invert(1);
-o-filter: invert(1);
}
.opacity img{ /*透明度*/
filter:opacity(0.6);
-webkit-filter: opacity(0.6);
-moz-filter: opacity(0.6);
-ms-filter: opacity(0.6);
-o-filter: opacity(0.6);
}
.brightness img{ /*亮度*/
filter:brightness(0.6);
-webkit-filter: brightness(0.6);
-moz-filter: brightness(0.6);
-ms-filter: brightness(0.6);
-o-filter: brightness(0.6);
}
.contrast img{ /*对比度*/
filter:contrast(5);
-webkit-filter: contrast(5);
-moz-filter: contrast(5);
-ms-filter: contrast(5);
-o-filter: contrast(5);
}
.drop-shadow img{ /*阴影*/
filter:drop-shadow(10px 10px 10px #000);
-webkit-filter: drop-shadow(10px 10px 10px #000);
-moz-filter: drop-shadow(10px 10px 10px #000);
-ms-filter: drop-shadow(10px 10px 10px #000);
-o-filter: drop-shadow(10px 10px 10px #000);
}
.blur img{ /*模糊*/
filter:blur(5px);
-webkit-filter: blur(5px);
-moz-filter: blur(5px);
-ms-filter: blur(5px);
-o-filter: blur(5px);
}
</style>
</head>
<body>
<div class="both none"><img src="img/4.jpg" alt=""></div>
<div class="both grayscale"><img src="img/4.jpg" alt=""></div>
<div class="both sepia"><img src="img/4.jpg" alt=""></div>
<div class="both saturate"><img src="img/4.jpg" alt=""></div>
<div class="both hue-rotate"><img src="img/4.jpg" alt=""></div>
<div class="both invert"><img src="img/4.jpg" alt=""></div>
<div class="both opacity"><img src="img/4.jpg" alt=""></div>
<div class="both brightness"><img src="img/4.jpg" alt=""></div>
<div class="both contrast"><img src="img/4.jpg" alt=""></div>
<div class="both drop-shadow"><img src="img/4.jpg" alt=""></div>
<div class="both blur"><img src="img/4.jpg" alt=""></div>
</body>
</html>
