如何使用CSS3模糊图像,而不裁剪或淡化边缘? [英] How to blur an image using CSS3 without cropping or fading the edges?
问题描述
如何使用CSS3正确模糊图片,而不会使边缘消失或裁剪图片?
HTML:
< div id =bg_imgclassid =blink_me>< / div>
CSS :
/ *常规的做法* /
body {
background-color:#0F0;
margin:0;
padding:0;
}
#bg_img {
filter:blur(50px); / *设置模糊量,px单位在重新缩放窗口大小时是坏的* /
-webkit-filter:blur(50px); / *设置模糊量,px单位在重新缩放窗口大小时是坏的* /
position:absolute;
width:100%;
height:100%;
background-image:url(http://www.patan77.com/wallpaper/3d_cube_explosion_patan77.jpg); / * background image * /
background-repeat:no-repeat;
background-size:cover;
background-position:center center;
}
解决方案我想出了,它有点黑客和位乱,但它的工作原理。
我这样做的方式是首先创建一个3x3网格和他们与比例也偏移一切轻微,然后我放大到300%,但这里是奇怪的部分,实际上得到它的工作,我需要确保它渲染的div外面的瓷砖,所以我需要有一个隐藏动画div (代码中的#load_dot)在正确的z-index,强制它渲染所有。
:对模糊比例使用 vh 或 vw 而不是 px 。
镜像瓷砖
HTML :
< a href ='http://www.patan77.com'id ='text_overlay'class ='blink_me'target ='_ blank'> Patan77.com< / a>
< div id =loading_dotclass =blink_me>< / div>
< div id =wrapper0>
< div id =wrapper1>
< div id =wrapper2>
< div id =bg1class =bg_img>< / div>
< div id =bg2class =bg_img>< / div>
< div id =bg3class =bg_img>< / div>
< div id =bg4class =bg_img>< / div>
< div id =bg5class =bg_img>可见DIV< / div>
< div id =bg6class =bg_img>< / div>
< div id =bg7class =bg_img>< / div>
< div id =bg8class =bg_img>< / div>
< div id =bg9class =bg_img>< / div>
< / div>
< / div>
< / div>
CSS :
body {
background-color:#0F0;
margin:0;
padding:0;
}
#text_overlay {
position:absolute;
z-index:20;
outline:none;
text-decoration:none;
font-family:Arial,Helvetica,sans-serif;
color:#FFF;
font-size:3em;
top:50%;
left:50%;
margin-right:-50%;
transform:translate(-50%,-50%)
}
.bg_img {
position:absolute;
background-image:url(http://www.patan77.com/wallpaper/3d_cube_explosion_patan77.jpg); / * background image * /
background-repeat:no-repeat;
background-size:cover;
background-position:center center;
width:calc(100%/ 3);
height:calc(100%/ 3);
}
#wrapper0 {
position:absolute;
width:100%;
height:100%;
overflow:hidden;
}
#wrapper1 {
position:absolute;
width:300%; / * 1将它们改为100%以缩小* /
height:300%; / * 2将它们改为100%以缩小* /
top:-50%; / * 3将这些更改为0以缩小* /
left:-50%; / * 4将这些更改为0以缩小* /
z-index:10;
}
#wrapper2 {
filter:blur(6vh); / *设置模糊量使用vh单位* /
-webkit-filter:blur(6vh); / *设置模糊量使用vh单位* /
position:absolute;
width:100%;
height:100%;
z-index:10;
}
#bg1 {
position:absolute;
left:calc(-100%/ 6);
top:calc(-100%/ 6);
-webkit-transform:scale(-1,-1);
transform:scale(-1,-1);
}
#bg2 {
left:calc(100%/ 6);
top:calc(-100%/ 6);
-webkit-transform:scale(1,-1);
transform:scale(1,-1);
}
#bg3 {
left:calc(100%/ 2);
top:calc(-100%/ 6);
-webkit-transform:scale(-1,-1);
transform:scale(-1,-1);
}
#bg4 {
-webkit-transform:scale(-1,1);
transform:scale(-1,1);
left:calc(-100%/ 6);
top:calc(100%/ 6);
}
#bg5 {
left:calc(100%/ 6);
top:calc(100%/ 6);
color:#FFF;
font-size:50px;
text-align:center;
}
#bg6 {
-webkit-transform:scale(-1,1);
transform:scale(-1,1);
left:calc(100%/ 2);
top:calc(100%/ 6);
}
#bg7 {
-webkit-transform:scale(-1,-1);
transform:scale(-1,-1);
left:calc(-100%/ 6);
top:calc(100%/ 2);
}
#bg8 {
-webkit-transform:scale(1,-1);
transform:scale(1,-1);
left:calc(100%/ 6);
top:calc(100%/ 2);
}
#bg9 {
-webkit-transform:scale(-1,-1);
transform:scale(-1,-1);
left:calc(100%/ 2);
top:calc(100%/ 2);
}
.blink_me {
-webkit-animation-name:blinker;
-webkit-animation-duration:1s;
-webkit-animation-timing-function:ease;
-webkit-animation-iteration-count:infinite;
-moz-animation-name:blinker;
-moz-animation-duration:1s;
-moz-animation-timing-function:ease;
-moz-animation-iteration-count:infinite;
animation-name:blinker;
animation-duration:1s;
animation-timing-function:ease;
animation-iteration-count:infinite;
}
@ -moz-keyframes blinker {
0%{opacity:1.0; }
50%{opacity:0.5; }
100%{opacity:1.0; }
}
@ -webkit-keyframes blinker {
0%{opacity:1.0; }
50%{opacity:0.5; }
100%{opacity:1.0; }
}
@keyframes blinker {
0%{opacity:1.0; }
50%{opacity:0.5; }
100%{opacity:1.0; }
}
How can you properly blur an image using CSS3 without fading the edges or cropping the image?
The issue the green BG show thru:
HTML:
<div id="bg_img" classid="blink_me"></div>
CSS:
/*regular way of doing it*/
body{
background-color: #0F0;
margin: 0;
padding: 0;
}
#bg_img{
filter: blur(50px); /*Set amount of blur, px units are bad when re-scaling the window size */
-webkit-filter: blur(50px); /*Set amount of blur, px units are bad when re-scaling the window size */
position:absolute;
width: 100%;
height: 100%;
background-image: url(http://www.patan77.com/wallpaper/3d_cube_explosion_patan77.jpg); /*background image*/
background-repeat:no-repeat;
background-size: cover;
background-position: center center;
}
This is the solution I came up with, its a bit of a "hack" and bit messy, but it works. (at least for me on chrome )
The way I did it was to first create a 3x3 grid and "mirror tile them"with the scale also and offset everything slightly and then I zoomed in to 300% but here is the strange part to actually get it to work I needed to make sure it rendered the tiles outside of the div so I need to have a hidden animated div (#loading_dot in the code) at the correct z-index, forcing it to render all.
//tip: use vh or vw instead of px for the blur scale.
The image mirror tiled
HTML:
<a href='http://www.patan77.com' id='text_overlay' class='blink_me' target='_blank'>Patan77.com</a>
<div id="loading_dot" class="blink_me"></div>
<div id="wrapper0">
<div id="wrapper1">
<div id="wrapper2">
<div id="bg1" class="bg_img"></div>
<div id="bg2" class="bg_img"></div>
<div id="bg3" class="bg_img"></div>
<div id="bg4" class="bg_img"></div>
<div id="bg5" class="bg_img">Visible DIV</div>
<div id="bg6" class="bg_img"></div>
<div id="bg7" class="bg_img"></div>
<div id="bg8" class="bg_img"></div>
<div id="bg9" class="bg_img"></div>
</div>
</div>
</div>
CSS:
body{
background-color: #0F0;
margin: 0;
padding: 0;
}
#text_overlay{
position:absolute;
z-index: 20;
outline: none;
text-decoration: none;
font-family:Arial, Helvetica, sans-serif;
color: #FFF;
font-size: 3em;
top: 50%;
left: 50%;
margin-right: -50%;
transform: translate(-50%, -50%)
}
.bg_img{
position:absolute;
background-image: url(http://www.patan77.com/wallpaper/3d_cube_explosion_patan77.jpg); /*background image*/
background-repeat:no-repeat;
background-size: cover;
background-position: center center;
width: calc(100% /3);
height: calc(100% /3);
}
#wrapper0{
position:absolute;
width: 100%;
height: 100%;
overflow:hidden;
}
#wrapper1{
position:absolute;
width: 300%; /* 1 change these to 100% to zoom out*/
height: 300%; /* 2 change these to 100% to zoom out*/
top: -50%; /* 3 change these to 0 to zoom out*/
left: -50%; /* 4 change these to 0 to zoom out*/
z-index: 10;
}
#wrapper2{
filter: blur(6vh); /*Set amount of blur use vh units*/
-webkit-filter: blur(6vh); /*Set amount of blur use vh units*/
position:absolute;
width: 100%;
height: 100%;
z-index: 10;
}
#bg1{
position:absolute;
left: calc(-100% /6);
top: calc(-100% /6);
-webkit-transform: scale(-1,-1);
transform: scale(-1,-1);
}
#bg2{
left:calc(100% /6);
top: calc(-100% /6);
-webkit-transform: scale(1,-1);
transform: scale(1,-1);
}
#bg3{
left:calc(100% /2);
top: calc(-100% /6);
-webkit-transform: scale(-1,-1);
transform: scale(-1,-1);
}
#bg4{
-webkit-transform: scale(-1,1);
transform: scale(-1,1);
left: calc(-100% /6);
top:calc(100% /6);
}
#bg5{
left:calc(100% /6);
top:calc(100% /6);
color: #FFF;
font-size:50px;
text-align: center;
}
#bg6{
-webkit-transform: scale(-1,1);
transform: scale(-1,1);
left:calc(100% /2);
top:calc(100% /6);
}
#bg7{
-webkit-transform: scale(-1,-1);
transform: scale(-1,-1);
left:calc(-100% /6);
top:calc(100% /2);
}
#bg8{
-webkit-transform: scale(1,-1);
transform: scale(1,-1);
left:calc(100% /6);
top:calc(100% /2);
}
#bg9{
-webkit-transform: scale(-1,-1);
transform: scale(-1,-1);
left:calc(100% /2);
top:calc(100% /2);
}
.blink_me {
-webkit-animation-name: blinker;
-webkit-animation-duration: 1s;
-webkit-animation-timing-function: ease;
-webkit-animation-iteration-count: infinite;
-moz-animation-name: blinker;
-moz-animation-duration: 1s;
-moz-animation-timing-function: ease;
-moz-animation-iteration-count: infinite;
animation-name: blinker;
animation-duration: 1s;
animation-timing-function: ease;
animation-iteration-count: infinite;
}
@-moz-keyframes blinker {
0% { opacity: 1.0; }
50% { opacity: 0.5; }
100% { opacity: 1.0; }
}
@-webkit-keyframes blinker {
0% { opacity: 1.0; }
50% { opacity: 0.5; }
100% { opacity: 1.0; }
}
@keyframes blinker {
0% { opacity: 1.0; }
50% { opacity: 0.5; }
100% { opacity: 1.0; }
}
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