我可以在同一属性中设置背景图像和不透明度吗？

时间：2010-11-15 11:37:56

标签： css

我可以在CSS参考how to set image transparency和how to set a background image中看到。但是如何组合这两个以设置透明背景图像呢？

我有一个我想用作背景的图像，但它太亮了 - 我想将不透明度降低到约0.2。我怎么能这样做？

#main {
    background-image: url(/wp-content/uploads/2010/11/tandem.jpg); 
}

15 个答案:

答案 0 :(得分：337)

#main {
    position: relative;
}
#main:after {
    content : "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-image: url(/wp-content/uploads/2010/11/tandem.jpg); 
    width: 100%;
    height: 100%;
    opacity : 0.2;
    z-index: -1;
}

答案 1 :(得分：127)

两种方法：

  1. 转换为PNG并使原始图像为0.2不透明度
  2. （更好的方法）<div> position: absolute; #main之前#main和opacity: 0.2; filter: alpha(opacity=20);高度相同，然后应用背景图像和{{1}}

答案 2 :(得分：103)

1 div和NO透明图像的解决方案：

您可以使用多背景CSS3功能并放置两个背景：一个带有图像，另一个带有透明面板（因为我认为没有办法直接设置背景图像的不透明度）：

background: -moz-linear-gradient(top, rgba(0, 0, 0, 0.7) 0%, rgba(0, 0, 0, 0.7) 100%), url(bg.png) repeat 0 0, url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

background: -moz-linear-gradient(top, rgba(255,255,255,0.7) 0%, rgba(255,255,255,0.7) 100%), url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(255,255,255,0.7)), color-stop(100%,rgba(255,255,255,0.7))), url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

background: -webkit-linear-gradient(top, rgba(255,255,255,0.7) 0%,rgba(255,255,255,0.7) 100%), url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

background: -o-linear-gradient(top, rgba(255,255,255,0.7) 0%,rgba(255,255,255,0.7) 100%), url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

background: -ms-linear-gradient(top, rgba(255,255,255,0.7) 0%,rgba(255,255,255,0.7) 100%), url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

background: linear-gradient(to bottom, rgba(255,255,255,0.7) 0%,rgba(255,255,255,0.7) 100%), url(https://cdn.sstatic.net/stackoverflow/img/apple-touch-icon.png) repeat 0 0;

你不能使用rgba(255,255,255,0.5)，因为它只能在后面被接受，所以我在这个例子中为每个浏览器使用了生成的渐变（这就是为什么它如此之长）。但这个概念如下：

background: tranparentColor, url("myImage");

http://jsfiddle.net/pBVsD/1/

答案 3 :(得分：54)

简单解决方案

如果您只需要将渐变设置为 background-image ：

background-image: url(IMAGE_URL); /* fallback for older browsers */

background-image: linear-gradient(to bottom, rgba(0,0,0,0.6) 0%,rgba(0,0,0,0.6) 100%), url(IMAGE_URL);

答案 4 :(得分：40)

我看到了这一点，在CSS3中，您现在可以像这样放置代码。让我们说我希望它涵盖整个背景我会做这样的事情。然后使用hsla(0,0%,100%,0.70)或rgba，使用白色背景，无论百分比饱和度或不透明度，都可以获得所需的外观。 

.body{
    background-attachment: fixed;
    background-image: url(../images/Store1.jpeg);
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    background-color: hsla(0,0%,100%,0.70);
    background-blend-mode: overlay;
    background-repeat: no-repeat;
}

答案 5 :(得分：9)

您可以使用CSS psuedo selector :: after来实现此目的。这是一个有效的演示。

enter image description here

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class Email 
{
    string name;
    string email;
    string subject;
    string message;
}
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.bg-container{
  width: 100%;
  height: 300px;
  border: 1px solid #000;
  position: relative;
}
.bg-container .content{
  position: absolute;
  z-index:999;
  text-align: center;
  width: 100%;
}
.bg-container::after{
  content: "";
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  z-index:99;
  background-image: url(https://i.stack.imgur.com/Hp53k.jpg);
  background-size: cover;
  opacity: 0.4;
}
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答案 6 :(得分：2)

我使用了@Dan Eastwell的答案，效果很好。代码类似于他的代码，但有一些补充。

.granddata {
    position: relative;
    margin-left :0.5%;
    margin-right :0.5%;
}
.granddata:after {
    content : "";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    background-image: url("/Images/blabla.jpg");
    width: 100%;
    height: 100%;
    opacity: 0.2;
    z-index: -1;
    background-repeat: no-repeat;
    background-position: center;
    background-attachment:fixed;
}

答案 7 :(得分：2)

我有一个类似的问题。我有一个图像，想要降低透明度，并且图像后面有黑色背景。而不是降低不透明度或创建黑色背景或任何辅助div，我将图像的线性渐变全部设置在一行上：

background: linear-gradient(to bottom, rgba(0, 0, 0, 0.8) 0%, rgba(0, 0, 0, 0.8) 100%), url("/img/picture.png");

答案 8 :(得分：1)

在CSS中添加... 

 filter: opacity(50%);

在JavaScript中使用... 

 element.style.filter='opacity(50%)';

注意：根据需要添加供应商前缀，但Chromium应该没有。

答案 9 :(得分：1)

为简单图像执行此操作的一个好方法是仅使用CSS来设置HTML元素的背景。

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HTML {
    background: url('http://www.earthtimes.org/newsimage/eat-lead-by-example-obesity-expert-tells-parents_139.jpg');
    width: 100%;
    height: 100%;
}
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如果你想获得花哨并设置其不透明度，那么，在IE9 + *中，你可以设置身体的透明背景颜色。这通过覆盖半透明白色来使图像更白，并且看起来更亮。例如，具有75％不透明度（rgba(255,255,255,.75)）的白色会产生以下效果。

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HTML {
  background: url('http://www.earthtimes.org/newsimage/eat-lead-by-example-obesity-expert-tells-parents_139.jpg');
  width: 100%;
  height: 100%;
  position: relative;
}

body {
  width: 100%;
  min-height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  margin: 0;
  background: rgba(255, 255, 255, .75);
}
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<p>Lorem ipsum dolor sit amet, et id, maecenas a convallis, elit facilisi congue augue id ac. Suscipit luctus egestas rutrum, amet tincidunt porttitor ante convallis magna, vivamus amet at turpis, ante lacinia blandit vel metus mauris rutrum. Ipsum nam adipiscing.
  Est sapien quis sem vestibulum, quis cubilia turpis, suspendisse mattis vehicula enim risus pede, placerat suspendisse dui. Convallis nostrud pede, mollit lobortis, ornare ipsum tempor faucibus tortor, vel pede, porttitor nulla nonummy vestibulum purus.
  Eros placerat tenetur augue ipsum aliquam, pellentesque congue condimentum sed vitae lectus.</p>
<p>Aliquam venenatis curabitur pellentesque sociosqu quam. Tincidunt id erat vestibulum in, est fermentum ipsum et augue, nascetur etiam. Lorem elit, sed donec, leo vivamus ac id enim faucibus vel. Nullam sit feugiat sed massa consectetuer auctor, nulla
  et erat lacinia nec, eget ut ante nullam est non in, elit porttitor in in donec eget porttitor. Interdum ultricies sem morbi facilisis nibh erat. Id suspendisse, sed tincidunt fringilla sit, sapien odio vel, at culpa augue sed taciti neque inceptos,
  massa class non. Vel tristique condimentum at pellentesque, commodo nulla sagittis rhoncus lorem. Viverra maecenas tellus pretium urna mauris proin, vel libero morbi, ante volutpat vestibulum augue. Itaque leo mauris turpis, vivamus nisl congue nisl
  nulla in turpis, eget vitae accumsan dolor ipsum leo venenatis, feugiat vehicula in risus, donec eu pede vivamus itaque nam. Justo amet vitae pellentesque sed, posuere fusce sapien, sed nam placerat libero sed etiam curabitur, suspendisse justo, amet
  porttitor.</p>
<p>Condimentum eget. Sem elementum a et mauris sem a, velit justo consectetuer in turpis mauris, sit sed elit cum, fusce suspendisse pretium dictum, mattis dui tortor tellus. Volutpat ut ante lorem nec laoreet aliquam, lorem est magna amet, integer mauris
  purus tellus. Porta enim repellendus aliquam eros. Turpis posuere elementum suscipit wisi lobortis, nec nunc consequat dictum ut unde at, mi lorem amet nunc. Cubilia pede, integer dolor, eget platea felis elit enim rhoncus, integer proin quam in ipsum
  lorem, diam curabitur netus pretium pellentesque. Donec rutrum ultrices placerat, curabitur maecenas, feugiat pede varius accumsan quam lorem, dui et dictumst asperiores nulla, vivamus urna nam leo libero. Posuere non convallis amet justo parturient,
  imperdiet consectetuer arcu praesent cursus risus, quis pretium dolor.</p>
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  • 提示注意HTML的格式为position: relative，而正文为position: absolute。这是为了防止身体的背景颜色更像是体内文字的突出显示。

这甚至可以通过改变身体的RGBA颜色背景，扩展到与CSS过滤器相当但仍然非常的东西。例如，正如您在代码段中看到的那样，rgba(0,255,0,.75)会创建一个非常绿色的色调。

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＆＃13; 
HTML {
    background: url('http://www.earthtimes.org/newsimage/eat-lead-by-example-obesity-expert-tells-parents_139.jpg');
    width: 100%;
    height: 100%;
    position: relative;
}
body {
    width: 100%;
    min-height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    margin: 0;
    background: rgba(0,255,0,.75);
}
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<p>Aliquam venenatis curabitur pellentesque sociosqu quam. Tincidunt id erat vestibulum in, est fermentum ipsum et augue, nascetur etiam. Lorem elit, sed donec, leo vivamus ac id enim faucibus vel. Nullam sit feugiat sed massa consectetuer auctor, nulla et erat lacinia nec, eget ut ante nullam est non in, elit porttitor in in donec eget porttitor. Interdum ultricies sem morbi facilisis nibh erat. Id suspendisse, sed tincidunt fringilla sit, sapien odio vel, at culpa augue sed taciti neque inceptos, massa class non. Vel tristique condimentum at pellentesque, commodo nulla sagittis rhoncus lorem. Viverra maecenas tellus pretium urna mauris proin, vel libero morbi, ante volutpat vestibulum augue. Itaque leo mauris turpis, vivamus nisl congue nisl nulla in turpis, eget vitae accumsan dolor ipsum leo venenatis, feugiat vehicula in risus, donec eu pede vivamus itaque nam. Justo amet vitae pellentesque sed, posuere fusce sapien, sed nam placerat libero sed etiam curabitur, suspendisse justo, amet porttitor.</p>
<p>Condimentum eget. Sem elementum a et mauris sem a, velit justo consectetuer in turpis mauris, sit sed elit cum, fusce suspendisse pretium dictum, mattis dui tortor tellus. Volutpat ut ante lorem nec laoreet aliquam, lorem est magna amet, integer mauris purus tellus. Porta enim repellendus aliquam eros. Turpis posuere elementum suscipit wisi lobortis, nec nunc consequat dictum ut unde at, mi lorem amet nunc. Cubilia pede, integer dolor, eget platea felis elit enim rhoncus, integer proin quam in ipsum lorem, diam curabitur netus pretium pellentesque. Donec rutrum ultrices placerat, curabitur maecenas, feugiat pede varius accumsan quam lorem, dui et dictumst asperiores nulla, vivamus urna nam leo libero. Posuere non convallis amet justo parturient, imperdiet consectetuer arcu praesent cursus risus, quis pretium dolor.</p>
<p>Lorem ipsum dolor sit amet, et id, maecenas a convallis, elit facilisi congue augue id ac. Suscipit luctus egestas rutrum, amet tincidunt porttitor ante convallis magna, vivamus amet at turpis, ante lacinia blandit vel metus mauris rutrum. Ipsum nam adipiscing. Est sapien quis sem vestibulum, quis cubilia turpis, suspendisse mattis vehicula enim risus pede, placerat suspendisse dui. Convallis nostrud pede, mollit lobortis, ornare ipsum tempor faucibus tortor, vel pede, porttitor nulla nonummy vestibulum purus. Eros placerat tenetur augue ipsum aliquam, pellentesque congue condimentum sed vitae lectus.</p>
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  • 提示： RGBA对应 R ed G reen B lue A lpha。因此，浏览器会将rgba(0,255,0,.75)解释为{red:0, green:255, blue:0, alpha:'75%'}。
    • 所示的内容


*可在Can I Use.找到完整的兼容性表格。但请注意，您需要点击＆＃34;全部显示＆＃34;看IE9是否支持它。


附录

由于我已经回答了这个问题，但是我想添加更多内容，我正在使用本节的附录，并添加了一些可能有用的信息。因此，为了进一步推断上面的内容，你可以使用SVG作为背景图像来做出邪恶的令人敬畏的事情。例如，您可以创建一个带有酷网站图标的加载屏幕背景，如下面的base64编码SVG示例所示。

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HTML {
    background: url('data:image/svg+xml;base64,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');
    width: 100%;
    height: 100%;
    position: relative;
    background-size: cover;
}
body {
    width: 100%;
    min-height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    margin: 0;
    background: rgba(255,255,255,.5);
}
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<p>Condimentum eget. Sem elementum a et mauris sem a, velit justo consectetuer in turpis mauris, sit sed elit cum, fusce suspendisse pretium dictum, mattis dui tortor tellus. Volutpat ut ante lorem nec laoreet aliquam, lorem est magna amet, integer mauris purus tellus. Porta enim repellendus aliquam eros. Turpis posuere elementum suscipit wisi lobortis, nec nunc consequat dictum ut unde at, mi lorem amet nunc. Cubilia pede, integer dolor, eget platea felis elit enim rhoncus, integer proin quam in ipsum lorem, diam curabitur netus pretium pellentesque. Donec rutrum ultrices placerat, curabitur maecenas, feugiat pede varius accumsan quam lorem, dui et dictumst asperiores nulla, vivamus urna nam leo libero. Posuere non convallis amet justo parturient, imperdiet consectetuer arcu praesent cursus risus, quis pretium dolor.</p>
<p>Lorem ipsum dolor sit amet, et id, maecenas a convallis, elit facilisi congue augue id ac. Suscipit luctus egestas rutrum, amet tincidunt porttitor ante convallis magna, vivamus amet at turpis, ante lacinia blandit vel metus mauris rutrum. Ipsum nam adipiscing. Est sapien quis sem vestibulum, quis cubilia turpis, suspendisse mattis vehicula enim risus pede, placerat suspendisse dui. Convallis nostrud pede, mollit lobortis, ornare ipsum tempor faucibus tortor, vel pede, porttitor nulla nonummy vestibulum purus. Eros placerat tenetur augue ipsum aliquam, pellentesque congue condimentum sed vitae lectus.</p>
<p>Aliquam venenatis curabitur pellentesque sociosqu quam. Tincidunt id erat vestibulum in, est fermentum ipsum et augue, nascetur etiam. Lorem elit, sed donec, leo vivamus ac id enim faucibus vel. Nullam sit feugiat sed massa consectetuer auctor, nulla et erat lacinia nec, eget ut ante nullam est non in, elit porttitor in in donec eget porttitor. Interdum ultricies sem morbi facilisis nibh erat. Id suspendisse, sed tincidunt fringilla sit, sapien odio vel, at culpa augue sed taciti neque inceptos, massa class non. Vel tristique condimentum at pellentesque, commodo nulla sagittis rhoncus lorem. Viverra maecenas tellus pretium urna mauris proin, vel libero morbi, ante volutpat vestibulum augue. Itaque leo mauris turpis, vivamus nisl congue nisl nulla in turpis, eget vitae accumsan dolor ipsum leo venenatis, feugiat vehicula in risus, donec eu pede vivamus itaque nam. Justo amet vitae pellentesque sed, posuere fusce sapien, sed nam placerat libero sed etiam curabitur, suspendisse justo, amet porttitor.</p>
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  • 提示：background-size: cover CSS会将背景中的SVG徽标调整为HTML元素的大小。

答案 10 :(得分：0)

唯一只做背景透明度的CSS方式是通过RGBa，但由于你想使用图像，我建议使用Photoshop或Gimp使图像透明，然后用它作为背景。

答案 11 :(得分：0)

我刚刚在#main中添加了position = absolute，top = 0，width = 100％，并将不透明度值设置为#background 

#main{height:100%;position:absolute; top:0;width:100%}
#background{//same height as main;background-image:url(image URL);opacity:0.2}

我在主要广告之前将背景应用于div。

答案 12 :(得分：0)

尝试添加具有不透明度和背景图像的背景线性渐变。 在这个例子中，我使用了白色背景线性渐变。但是你可以使用任何 rgba 颜色

background: linear-gradient(rgba(255,255,255,.5), rgba(255,255,255,.5)), url("https://kusalthiwanka.github.io/images/kusal.jpg");

答案 13 :(得分：-1)

我遇到过这个帖子，因为我有同样的问题，然后我想为什么搞乱css，调整值和点击刷新，当你可以在Photoshop中轻松调整不透明度？复制图像，将其粘贴为新图层，然后移动不透明度滑块。

答案 14 :(得分：-1)

我有一个类似的问题，我只是用photoshop拍摄背景图片，然后用我需要的不透明度创建了一个新的.png。问题解决了，而不用担心我的CSS是否适用于所有设备＆amp;浏览器

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