Web Front-endCSS TutorialHow to achieve Gaussian blur effect of images in css3? CSS3 Filter implementation (code example)
This chapter introduces how to use CSS3 to achieve the Gaussian blur effect of images. CSS3 Filter implements blur processing of image elements. Let everyone understand how to set the blur effect of image elements. Through examples, it introduces the filter to achieve Gaussian blur of images. Three effects. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
1. What is filter
CSS3 Filter attribute defines the element (usually 
) visual effects that provide the ability to blur and change the color of elements. CSS3 Fitler is often used to adjust the rendering, background or border display effects of images.
Browser support:
-webkit-filter is an attribute of css3. Webkit is the first to support these functions, and the effect is very good.
#The number in the table indicates the version number of the first browser that supports this method.
The -webkit- immediately following the number is the prefix of the specified browser.
Note: The non-standard "filter" attribute supported by older versions of Internet Explorer (4.0 to 8.0) has been deprecated. IE8 and lower browsers usually use the css opacity attribute.
Let’s take a look at the filter attribute. The effects currently supported in the specification:
-
grayscale (grayscale): the value is a decimal between 0-1
sepia (brown): The value is a decimal between 0-1
saturate (saturation): The value is num
hue-rotate (hue rotation): the value is angle
invert (invert): the value is a decimal between 0-1
opacity (transparency): the value is a decimal between 0-1
brightness (brightness): the value is a decimal between 0-1
contrast (contrast): the value is num
blur (blur): the value is length (radius)
drop-shadow (shadow)
Filter syntax to achieve blur effect:
filter: blur();
blur() sets Gaussian blur to the image. The "length (radius)" value sets the standard deviation of the Gaussian function, or how many pixels are blended together on the screen, so the larger the value, the blurr it is; if there is no set value, the default is 0; this parameter can set the css length value, but percentage values are not accepted.
2. Three effects of image blur
Original picture:
1.css ordinary picture blur effect (the whole picture is blurred)
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片模糊</title>
<style>
.bg {
width: 1240px;
height: 592px;
position: relative;
background: url("How to achieve Gaussian blur effect of images in css3? CSS3 Filter implementation (code example)") no-repeat fixed;
padding: 1px;
box-sizing: border-box;
z-index: 1;
}
.bg:after {
content: "";
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
background: inherit;
filter: blur(2px);
z-index: 2;
}
.drag {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
width: 200px;
height: 200px;
text-align: center;
z-index: 11;
}
</style>
</head>
<body>
<div class="bg"></div>
</body>
</html>Effect picture:
2.css partial picture blur effect
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片模糊</title>
<style>
.bg {
width: 1240px;
height: 592px;
background: url("How to achieve Gaussian blur effect of images in css3? CSS3 Filter implementation (code example)") no-repeat fixed;
padding: 1px;
box-sizing: border-box;
z-index: 1;
}
.drag {
margin: 100px auto;
width: 300px;
height: 300px;
background: inherit;
position: relative;
text-align: center;
}
.drag>div {
width: 100%;
height: 100%;
text-align: center;
line-height: 200px;
position: absolute;
left: 0;
top: 0;
z-index: 11;
}
.drag:after {
content: "";
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
background: inherit;
filter: blur(30px);/*为了模糊更明显，调高模糊度*/
z-index: 2;
}
</style>
</head>
<body>
<div class="bg">
<div class="drag">like window</div>
</div>
</body>
</html> Rendering:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片模糊</title>
<style>
.bg {
width: 1240px;
height: 592px;
background: url("How to achieve Gaussian blur effect of images in css3? CSS3 Filter implementation (code example)") no-repeat fixed;
padding: 1px;
box-sizing: border-box;
z-index: 1;
}
.bg:after {
content: "";
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
background: inherit;
filter: blur(3px);
z-index: 1;
}
.drag {
position: absolute;
left: 40%;
top: 30%;
/*transform: translate(-50%,-50%);*/
width: 200px;
height: 200px;
text-align: center;
background: inherit;
z-index: 11;
box-shadow: 0 0 10px 6px rgba(0, 0, 0, .5);
}
</style>
</head>
<body>
<div class="bg">
<div class="drag">like window</div>
</div>
</body>
</html> Rendering: 
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