[Dilettante_Pro]

Или как-то так

<style>
.container {
   position:relative;
   display: inline-block;
}
.mask {
   position:absolute;
   top: 0px;
   left: 0px;
   width:100%;
   height:100%;
   background-image: -webkit-radial-gradient(50% 50%, ellipse closest-side, rgba(255,255,255,0) 40%, rgba(255,255,255,1));
     background-image: -moz-radial-gradient(50% 50%, ellipse closest-side, rgba(255,255,255,0) 40%, rgba(255,255,255,1));
  background-image: -o-radial-gradient(50% 50%, ellipse closest-side, rgba(255,255,255,0) 40%, rgba(255,255,255,1));
  background-image: -ms-radial-gradient(50% 50%, ellipse closest-side, rgba(255,255,255,0) 40%, rgba(255,255,255,1));
   z-index: 100;
}
</style>
<div class="container">
   <image src= "http://www.imageup.ru/img133/2542020/preload.png"/>
   <div class="mask">
   </div>
</div>