Is it possible to make a torn paper effect on edges of a picture

问题

Update 3

Hi guys, I updated the code (http://codepen.io/anon/pen/VYRJLp) and now the edges look really like torn paper effect. It uses SVG by the way.

The Only problem is I don't know how to make the image as the background of the svg AT THE SAME TIME maintain the torn-paper-like edges.

Please have a look it. Any efforts are appreciated.

Update 2

It seems that it is impossible to achieve this effect without the help of PhotoShop(PS), so I would like to add PS as a part of solution.

I am not a PS expert, but from a quick thought, I think there are a few steps I need to do:

Use PS to create a torn paper "shell", let's say it's shell.png It should only have color on its edges and the color should be white; the inner area is transparent, so that we can place the picture in it.
Place shell.png on top of the picture, let's say banner.jpg, which means set the z-index of the div which uses shell as its background image to 1.
Use another div to contain the banner.jpg and set the z-index below the shell div.

Questions for this approach:

Is it responsive?
If not, is it possible to make it responsive? As I have to make it work properly on mobile devices.

I remember that I saw a beautifully designed website, there is a picture in the background and the edges of this picture look like torn paper effect which is fantastic!

I searched the similar questions here but it turns out that the effects in the answers are primitive, which are very simple rugged black lines.

What I want:

I want this picture to be as wide as the device screen which means responsive.
The edges of this picture look like torn paper.
I will place this picture as a banner after the Top Navigation bar but before the content.

It should look like the white area in this picture. But in my case, I will need to fill in my picture to replace the white area.

Here is my code: Notice: in this code, the css uses an image as the edge, BUT that is not want I want. I just want the edges to be pure CSS effects.(Is this possible?) So it will look like this one(the one on the right side, you can see that there is no white rugged edges)

<div class="row">
    <div id="letter" class="col-lg-12 col-md-12 col-sm-12 col-xs-12">

    </div>
</div>

#letter { /*torn paper border*/
    height:450px;
    position:relative;
    top:0;
    bottom:0;
    left:0;
    right:0;
    background-image:url('img/background.jpg');
    background-size:cover;
    opacity:0.8;
    border-style: solid; 
    border-width: 40px 40px 40px; 
       -moz-border-image: url('http://news.unchealthcare.org/images/backgrounds/paper.jpg') 80 80 80 repeat; 
    -webkit-border-image: url('http://news.unchealthcare.org/images/backgrounds/paper.jpg') 80 80 80 repeat; 
         -o-border-image: url('http://news.unchealthcare.org/images/backgrounds/paper.jpg') 80 80 80 repeat; 
            border-image: url('http://news.unchealthcare.org/images/backgrounds/paper.jpg') 80 80 80 repeat;
}

Update

Hi guys,

I think I found something quite similar to what I am imagine. Here is the effect I want :

回答1:

I was able to do this with just CSS using border image slicing.

Here's the code:

body {
    background-image: url("https://i.postimg.cc/jdRfmPxv/1-2-OKX1nhs-Z3-CB2-Cid-Edh-Jw.png");
}
.border {
  border-width: 20px 0 20px 0;
  border-style:solid;
  border-image: url(https://i.postimg.cc/DZYqPDTD/bordernew.png) 50 0 50 0 repeat;
  -webkit-border-image: url(https://i.postimg.cc/DZYqPDTD/bordernew.png) 50 0 50 0 repeat;
  -moz-border-image: url(https://i.postimg.cc/DZYqPDTD/bordernew.png) 50 0 50 0 repeat;
  border-image-slice: 50 0 50 0 fill;
  border-image-width: 20 0 20 0;
  width: 100%;
  height: 60px;
}
.p {
  font-weight: bold;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

<div class="border" style="text-align:center;">
  <br />
  <span class="p">Coming soon...</span>
  <br />
  <br />
</div>

This gives me a height re-sizing div that always has the torn paper effect along the top and bottom. It's great for full width, but I wasn't able to figure out a decent way of doing the side edges at the same time as the top and bottom (easy to do the side edges if the top and bottom edges are straight).

I made the image in Photoshop - it's basically yellow in the middle, then torn and then transparent on the outer.

If you're not familiar with image slicing, the four numbers basically define (in order): the height in pixels of the top of the image that you want to use as the top border strip, the width in pixels for the right strip, then the bottom strip, then the left strip. The fill tells it to take the center part (which is discarded by default) and use it to fill the div between the borders.

Depending on your preferences you can have the border repeat (and get cut off at the end), round (repeat to the nearest number of full repetitions, which either compresses or stretches depending on which number it is nearer to) or stretch (stretches... although that distorts the image for this example).

It took some fiddling for me to get it to work correctly but I'm chuffed with the results. I couldn't find anyone with the same answer so thought I'd post it.

UPDATE

This feature IS supported in IE11 provided border-style:solid is specified. I use media queries to provide an alternative (shadows etc.) for IE10 and below where border-image is not supported (example on my website).

回答2:

Try this:

clip-path: polygon(3% 0, 7% 1%, 11% 0%, 16% 2%, 20% 0, 23% 2%, 28% 2%, 32% 1%, 35% 1%, 39% 3%, 41% 1%, 45% 0%, 47% 2%, 50% 2%, 53% 0, 58% 2%, 60% 2%, 63% 1%, 65% 0%, 67% 2%, 69% 2%, 73% 1%, 76% 1%, 79% 0, 82% 1%, 85% 0, 87% 1%, 89% 0, 92% 1%, 96% 0, 98% 3%, 99% 3%, 99% 6%, 100% 11%, 98% 15%, 100% 21%, 99% 28%, 100% 32%, 99% 35%, 99% 40%, 100% 43%, 99% 48%, 100% 53%, 100% 57%, 99% 60%, 100% 64%, 100% 68%, 99% 72%, 100% 75%, 100% 79%, 99% 83%, 100% 86%, 100% 90%, 99% 94%, 99% 98%, 95% 99%, 92% 99%, 89% 100%, 86% 99%, 83% 100%, 77% 99%, 72% 100%, 66% 98%, 62% 100%, 59% 99%, 54% 99%, 49% 100%, 46% 98%, 43% 100%, 40% 98%, 38% 100%, 35% 99%, 31% 100%, 28% 99%, 25% 99%, 22% 100%, 19% 99%, 16% 100%, 13% 99%, 10% 99%, 7% 100%, 4% 99%, 2% 97%, 1% 97%, 0% 94%, 1% 89%, 0% 84%, 1% 81%, 0 76%, 0 71%, 1% 66%, 0% 64%, 0% 61%, 0% 59%, 1% 54%, 0% 49%, 1% 45%, 0% 40%, 1% 37%, 0% 34%, 1% 29%, 0% 23%, 2% 20%, 1% 17%, 1% 13%, 0 10%, 1% 6%, 1% 3%);

回答3:

You could probably achieve this effect with a png image.

The top part should be black (or whatever the color of your header), the bottom is partly transparent to create the "torn effect", and your real image will be on a lower layer (z-index) to be partly hidden.

Reply to Update2 this is what I meant

Instead of creating a complete shell (a "square" hole), you can split the four edges in four images: top, right, bottom and left.

You can make it responsive by simply repeating the image on the whole length (the "start" and "end" of the four edges must be the same) *

来源：https://stackoverflow.com/questions/29349151/is-it-possible-to-make-a-torn-paper-effect-on-edges-of-a-picture

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