image optimization tools

I've heard you can increase website sales by optimizing your images. What are the best image optimization tools out there?

i like smush.it myself. whatever you choose, though, just make sure your tools preserve the quality of your images.

below is a link to a useful article on the subject:

20 Must-Have Image Optimization Tools for Designers | The Design Inspiration

Photoshop




http://www.imgsnatch.com/img/n/9.jpg