解决方法
像这样？
@keyframes toColor {
0% { -webkit-filter: grayscale(100%); filter: grayscale(100%); }
25% { -webkit-filter: grayscale(75%); filter: grayscale(75%); }
50% { -webkit-filter: grayscale(50%); filter: grayscale(50%); }
75% { -webkit-filter: grayscale(25%); filter: grayscale(25%); }
100% { -webkit-filter: grayscale(0%); filter: grayscale(0%); }
}
img.desaturate {
animation: toColor 10s;
}
<img src="http://i.imgur.com/gMPdDHk.jpg" alt="Lena Söderberg" style="width: 300px;" class="desaturate">
