I hope you are looking this :-
http://jsfiddle.net/rD6wq/18/
you can use css3 property -webkit-text-fill-color: transparent; for transparent text &
-webkit-background-clip: text; for call the bg image in text clip....
but these properties only support for web-kit browsers.....
HTML
<p>R</p>
<p>T</p>
<p>SUPER</p>
CSS
p{
font-size:5em;
font-family:impact;
background: url(http://farm8.staticflickr.com/7245/7086291447_06484c1d6a_z.jpg) fixed;
position:relative;
-webkit-text-fill-color: transparent;
-webkit-background-clip: text;
display:inline-block;
text-align:center;
padding:10px;
}
p:after{
content:'';
position:absolute;
background:rgba(0,0,0,0.5);
width:100%;
height:100%;
top:0;
left:0;
z-index:-1;
}
body{
background: url(http://farm8.staticflickr.com/7245/7086291447_06484c1d6a_z.jpg) fixed;
}