HTML / CSS - 在图像上创建alpha蒙版 [英] HTML/CSS - create alpha mask over image

问题描述

我想在我正在构建的网站中创建一个效果，其中图像被叠加层遮住。叠加层应该创建一个淡出效果 - 我实际上不想要任何动画，但叠加应该使图像看起来好像在边缘渐变为背景颜色。

如下所示： http://imgur.com/fqtc9.png p>

我喜欢使用CSS / HTML / JS - 而不是图片。任何想法从哪里开始？感谢。

解决方案

您可以这样做，例如：示例

html

 < div class =photo_container> 
< div class =photo> 
< img src =/ lakenwoods / images / mockup-photo.pngwidth =540height =463/>< / div> 
< div class =overlay> 
< div class =content> 
< h1>欢迎来到Lake-N-Woods Realty< / h1> 
< p> 
我们是一家多元化和高效的房地产公司，致力于满足我们所有的客户需求。我们专注于娱乐，农村和投资房地产Bemidji和明尼苏达州中北部。 
< / p> 
< / div> 
< / div> 
< div class =clear> 
< / div> 
< / div> 
  

CSS

  @charsetutf-8; 
 / * CSS文档* / 
 
 .clear {
 clear：both; 
} 
 
 .photo_container {
 position：relative; 
 width：540px; 
 height：463px; 
 overflow：hidden; 
 margin：0; padding：0; 
} 
 
 .photo_container .photo {
 z-index：1; 
 
} 
 
 
 .photo_container .overlay {
 width：540px; 
 height：463px; 
 background：url（/lakenwoods/images/mockup-overlay.png）no-repeat top center; 
 position：absolute; 
 bottom：0; 
 left：0; 
 z-index：10; 
 
} 
 
 .photo_container .overlay .content h1 {
 
 position：absolute; 
 top：310px; 
 left：34px; 
 font-family：Helvetica，Helvetica Neue，Arial，sans-serif; 
 font-size：18px; 
 color：#fff; 
 font-weight：700; 
 width：315px; 
 
} 
 
 
 .photo_container .overlay .content p {
 
 
 position：absolute; 
 top：335px; 
 left：34px; 
 font-family：Helvetica，Helvetica Neue，Arial，sans-serif; 
 font-size：12px; 
 color：#fff; 
 width：315px; 
 line-height：1.4em; 
 
} 
  

I'd like to create an effect in a site I’m building where an image is masked by an overlay. The overlay should create a "fade out" effect — I don’t actually want anything animated, but the overlay should make the image look as if it’s fading to the background colour at the edges.

Something like this: http://imgur.com/fqtc9.png

I prefer to do this with CSS/HTML/JS - not images. Any thoughts on where to start? Thanks.

解决方案

you could do something like this for example : Example

html

<div class="photo_container">
        <div class="photo">
<img src="/lakenwoods/images/mockup-photo.png" width="540" height="463" /></div>
        <div class="overlay">
            <div class="content">
                <h1>Welcome to Lake-N-Woods Realty</h1>
                <p>
                We are a Diverse and Highly Effective Real Estate Company, Dedicated to Satisfying all of our Clients Needs. We Specialize in Recreational, Rural and Investment Property throughout Bemidji and North Central Minnesota.
                </p>
                </div>
        </div>
        <div class="clear">
       </div>
   </div>

CSS

@charset "utf-8";
/* CSS Document */

.clear {
    clear:both;     
}

.photo_container {
    position: relative;
    width: 540px;
    height: 463px;
    overflow:hidden;
    margin: 0; padding:0;
}

.photo_container .photo {
    z-index:1;

}


.photo_container .overlay {
    width: 540px;
    height: 463px;
    background: url(/lakenwoods/images/mockup-overlay.png) no-repeat top center;
    position:absolute;
    bottom: 0;
    left: 0;
    z-index:10;

}

.photo_container .overlay .content h1 {

    position:absolute;
    top: 310px;
    left: 34px;
    font-family: Helvetica, Helvetica Neue, Arial, sans-serif;
    font-size:18px;
    color: #fff;
    font-weight: 700;
    width: 315px;

}


.photo_container .overlay .content p {


    position:absolute;
    top: 335px;
    left: 34px;
    font-family: Helvetica, Helvetica Neue, Arial, sans-serif;
    font-size:12px;
    color: #fff;
    width: 315px;
    line-height: 1.4em; 

}

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