Convert an image to grayscale in HTML/CSS

Question

Is there a simple way to display a color bitmap in grayscale with just HTML/CSS?

It doesn\'t need to be IE-compatible (and I imagine it won\'t be) -- if

Answer 1

If you, or someone else facing a similar problem in future are open to PHP. (I know you said HTML/CSS, but maybe you are already using PHP in the backend) Here is a PHP solution:

I got it from the PHP GD library and added some variable to automate the process...