我可以在同一属性中设置背景图像和不透明度吗? [英] Can I set background image and opacity in the same property?

问题描述

我可以在CSS参考资料中看到如何设置图像透明度和如何设置背景图片.但是，如何结合这两者以设置透明的背景图像?

I can see in CSS references how to set image transparency and how to set a background image. But how can I combine these two in order to set a transparent background image?

我有一张要用作背景的图像，但是它太亮了-我想将不透明度降低到约0.2.我该怎么办?

I have an image that I'd like to use as a background, but it is too bright - I'd like to turn the opacity down to about 0.2. How can I do this?

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

推荐答案

两种方法:

1. 转换为PNG并将原始图像设置为0.2不透明
2. (更好的方法)在#main之前的<div>为position: absolute;，并且高度与#main相同，然后应用背景图像和opacity: 0.2; filter: alpha(opacity=20);.

1. Convert to PNG and make the original image 0.2 opacity
2. (Better method) have a <div> that is position: absolute; before #main and the same height as #main, then apply the background-image and opacity: 0.2; filter: alpha(opacity=20);.

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