How to gray scale your images with CSS 3, without using photoshop. You can use this code with CSS mouse over hover effect. or to grayscale the images direclty on your web page
.grayimg:hover
{
filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
filter: gray;
-webkit-filter: grayscale(100%);
}