[css] How to set opacity in parent div and not affect in child div?

You can do it with pseudo-elements: (demo on dabblet.com) enter image description here

your markup:

<div class="parent">
    <div class="child"> Hello I am child </div>
</div>

css:

.parent{
    position: relative;
}

.parent:before {
    z-index: -1;
    content: '';
    position: absolute;

    opacity: 0.2;
    width: 400px;
    height: 200px;
    background: url('http://img42.imageshack.us/img42/1893/96c75664f7e94f9198ad113.png') no-repeat 0 0; 
}

.child{
    Color:black;
}

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