CSS filter

filter: none | blur() | brightness() | contrast() | drop-shadow() | grayscale() | hue-rotate() | invert() | opacity() | saturate() | sepia() | url();

img{
    float: left;
    width: 200px;
    height: 200px;
    margin: 5px;
}

/*高斯模糊*/
img:nth-of-type(2){
    filter: blur(5px);
}

/*曝光度*/
img:nth-of-type(3){
    filter: brightness(200%);
}

/*对比度*/
img:nth-of-type(4){
    filter: contrast(200%);
}

/*灰度*/
img:nth-of-type(5){
    filter: grayscale(100%);
}

/*色相旋转*/
img:nth-of-type(6){
    filter: hue-rotate(180deg);
}

/*反相*/
img:nth-of-type(7){
    filter: invert(100%);
}

/*透明程度*/
img:nth-of-type(8){
    filter: opacity(50%);
}

/*图像饱和度*/
img:nth-of-type(9){
    filter: saturate(800%);
}

/*将图像转换为深褐色*/
img:nth-of-type(10){
    filter: sepia(100%);
}

/*添加阴影*/
img:nth-of-type(11){
    filter: drop-shadow(5px 5px 5px red);
}

/*多个滤镜*/
img:nth-of-type(12){
    filter: saturate(800%) blur(10px);
}