How to “crop” a rectangular image into a square wi

问题:

I know that it is impossible to actually modify an image with CSS, which is why I put crop in quotes.

What I'd like to do is take rectangular images and use CSS to make them appear square without distorting the image at all.

I'd basically like to turn this:

Into this:

回答1:

Assuming they do not have to be in IMG tags...

HTML:

<div class="thumb1">
</div>

CSS:

.thumb1 { 
  background: url(blah.jpg) 50% 50% no-repeat; /* 50% 50% centers image in div */
  width: 250px;
  height: 250px;
}

.thumb1:hover { YOUR HOVER STYLES HERE }

EDIT: If the div needs to link somewhere just adjust HTML and Styles like so:

HTML:

<div class="thumb1">
<a href="#">Link</a>
</div>

CSS:

.thumb1 { 
  background: url(blah.jpg) 50% 50% no-repeat; /* 50% 50% centers image in div */
  width: 250px;
  height: 250px;
}

.thumb1 a {
  display: block;
  width: 250px;
  height: 250px;
}

.thumb1 a:hover { YOUR HOVER STYLES HERE }

Note this could also be modified to be responsive, for example % widths and heights etc.

回答2:

A pure CSS solution with no wrapper div or other useless code:

img {
  object-fit: cover;
  width:230px;
  height:230px;
}

回答3:

1. Place your image in a div.
2. Give your div explicit square dimensions.
3. Set the CSS overflow property on the div to hidden (overflow:hidden).
4. Put your imagine inside the div.
5. Profit.

For example:

<div style="width:200px;height:200px;overflow:hidden">
    <img src="foo.png" />
</div>

回答4:

Using background-size:cover - http://codepen.io/anon/pen/RNyKzB

CSS:

.image-container {
  background-image: url('http://i.stack.imgur.com/GA6bB.png');
  background-size:cover;
  background-repeat:no-repeat;
  width:250px;
  height:250px;
}  

Markup:

<div class="image-container"></div>

回答5:

I actually came across this same problem recently and ended up with a slightly different approach (I wasn't able to use background images). It does require a tiny bit of jQuery though to determine the orientation of the images (I' sure you could use plain JS instead though).

I wrote a blog post about it if you are interested in more explaination but the code is pretty simple:

HTML:

<ul class="cropped-images">
  <li><img src="http://fredparke.com/sites/default/files/cat-portrait.jpg" /></li>
  <li><img src="http://fredparke.com/sites/default/files/cat-landscape.jpg" /></li>
</ul>

CSS:

li {
  width: 150px; // Or whatever you want.
  height: 150px; // Or whatever you want.
  overflow: hidden;
  margin: 10px;
  display: inline-block;
  vertical-align: top;
}
li img {
  max-width: 100%;
  height: auto;
  width: auto;
}
li img.landscape {
  max-width: none;
  max-height: 100%;
}

jQuery:

$( document ).ready(function() {

    $('.cropped-images img').each(function() {
      if ($(this).width() > $(this).height()) {
        $(this).addClass('landscape');        
      }
    });

});

回答6:

Use CSS: overflow:

.thumb {
   width:230px;
   height:230px;
   overflow:hidden
}

回答7:

I had a similar issue and could not "compromise" with background images. I came up with this.

<div class="container">
    <img src="http://lorempixel.com/800x600/nature">
</div>

.container {
    position: relative;
    width: 25%; /* whatever width you want. I was implementing this in a 4 tile grid pattern. I used javascript to set height equal to width */
    border: 2px solid #fff; /* just to separate the images */
    overflow: hidden; /* "crop" the image */
    background: #000; /* incase the image is wider than tall/taller than wide */
}

.container img {
    position: absolute;
    display: block;
    height: 100%; /* all images at least fill the height */
    top: 50%; /* top, left, transform trick to vertically and horizontally center image */
    left: 50%;
    transform: translate3d(-50%,-50%,0);
}

//assuming you're using jQuery
var h = $('.container').outerWidth();
$('.container').css({height: h + 'px'});

Hope this helps!

Example: https://jsfiddle.net/cfbuwxmr/1/

回答8:

Either use a div with square dimensions with the image inside with the .testimg class:

.test {
width: 307px;
height: 307px;
overflow:hidden
}

.testimg {
    margin-left: -76px

}

or a square div with a background of the image.

.test2 {
width: 307px;
height: 307px;
    background: url(http://i.stack.imgur.com/GA6bB.png) 50% 50%
}

Here's some examples: http://jsfiddle.net/QqCLC/1/

UPDATED SO THE IMAGE CENTRES

.test {
  width: 307px;
  height: 307px;
  overflow: hidden
}

.testimg {
  margin-left: -76px
}

.test2 {
  width: 307px;
  height: 307px;
  background: url(http://i.stack.imgur.com/GA6bB.png) 50% 50%
}

<div class="test"><img src="http://i.stack.imgur.com/GA6bB.png" width="460" height="307" class="testimg" /></div>

<div class="test2"></div>