Change background image opacity

Question

I have a div element with text blocks and a parent div in which I have set a background image. Now I want to reduce the opacity of the background image. Please suggest how I can do that.

Thanks in advance.

EDIT:

I am looking to change the way my blog post looks at blogger.com by editing the html content. The html code looks as follows:

<div>  //my blog post </div> 

I tried to surround the whole code above with a div element and set opacity of each div separately as below:

<div style="background-image:url("image.jpg"); opacity:0.5;"> <div style="opacity:1;">  //my blog post </div> </div> 

But it is not working.

Answer 1

Nowadays, it is possible to do it simply with CSS property "background-blend-mode".

<div id="content">Only one div needed</div>  div#content {     background-image: url(my_image.png);     background-color: rgba(255,255,255,0.6);     background-blend-mode: lighten;     /* You may add things like width, height, background-size... */ } 

It will blend the background-color (which is white, 0.6 opacity) into the background image. Learn more here (W3S).

Answer 2

You can't use transparency on background-images directly, but you can achieve this effect with something like this:

http://jsfiddle.net/m4TgL/

HTML:

<div class="container">     <div class="content">//my blog post</div> </div>​ 

CSS:

.container {  position: relative; }  .container:before {     content: "";     position: absolute;     top: 0;     bottom: 0;     left: 0;     right: 0;     z-index: 1;     background-image: url('image.jpg');    opacity: 0.5; }  .content {     position: relative;      z-index: 2; }​