Defined Edges With CSS3 Filter Blur

I am blurring some images with this code

img {
  filter: blur(5px);
  -webkit-filter: blur(5px);
  -moz-filter: blur(5px);
  -o-filter: blur(5px);
  -ms-filter: blur(5px);
}

The edges of the image get blurred too though. Is it possible to blur the image, while keeping the edges defined? Like an inset blur or something?

Solution 1:

You could put it in a <div> with overflow: hidden; and set the <img> to margin: -5px -10px -10px -5px;.

Demo:

Output

CSS

img {
    filter: blur(5px);
        -webkit-filter: blur(5px);
        -moz-filter: blur(5px);
        -o-filter: blur(5px);
        -ms-filter: blur(5px);
    margin: -5px -10px -10px -5px;
}

div {
    overflow: hidden;
}
​

HTML

<div><img src="http://placekitten.com/300" />​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​</div>​​​​​​​​​​​​

Solution 2:

I was able to make this work with the

transform: scale(1.03);

Property applied on the image. For some reason, on Chrome, the other solutions provided wouldn't work if there was any relatively positioned parent element.

Check http://jsfiddle.net/ud5ya7jt/

This way the image will be slightly zoomed in by 3% and the edges will be cropped which shouldn't be a problem on a blurred image anyway. It worked well in my case because I was using a high res image as a background. Good luck!

Solution 3:

I used -webkit-transform: translate3d(0, 0, 0); with overflow:hidden;.

DOM:

<div class="parent">
    <img class="child" src="http://placekitten.com/100" />
</div>

CSS:

.parent {
    width: 100px;
    height: 100px;
    overflow: hidden;
    -webkit-transform: translate3d(0, 0, 0);
}
.child {
    -webkit-filter: blur(10px);
}

DEMO: http://jsfiddle.net/DA5L4/18/

This technic works on Chrome34 and iOS7.1

Update

http://jsfiddle.net/DA5L4/50/

if you use latest version of Chrome, you don't need to use -webkit-transform: translate3d(0, 0, 0); hack. But it doesn't works on Safari(webkit).

Solution 4:

You can also keep the whole video, you do not have to cut something away.
You can overlay inset shadows over the white-blurred edges.

This looks really nice as well :)

Just paste this code to your videos' parent:

.parent {
    -webkit-box-shadow: inset 0 0 200px #000000;
       -moz-box-shadow: inset 0 0 200px #000000;
            box-shadow: inset 0 0 200px #000000;
}

Solution 5:

In the many situations where the IMG can be made position:absolute, you can use clip to hide the blurred edges--and the outer DIV is unnecessary.

img {
    filter: blur(5px);
        -webkit-filter: blur(5px);
        -moz-filter: blur(5px);
        -o-filter: blur(5px);
        -ms-filter: blur(5px);
    position: absolute;
    clip: rect(5px,295px,295px;5px);
}