.siyahbeyaz img {
-webkit-filter: grayscale(1); /* Chrome 19+, Safari 6+, Safari 6+ iOS */
}
<h4>Webkit greyscale</h4>
<div class="siyahbeyaz">
<a href="http://www.mintik.com/?p=19031"><img src="http://lorempixel.com/400/200/nature/1/" /></a>
</div>
<h4>Resmin normal hali</h4>
<a href="http://www.mintik.com/?p=19031"><img src="http://lorempixel.com/400/200/nature/1/" /></a>