I understand it is possible to make one colour transparent when you save a photoshop file for the web. This is useful to make objects appear to float over backgrounds on your web page.
My problem is that I don't know HOW to do this! When I save for web, I can't see how I select a colour to be transparent. If you set the background as transparent when you create your image, it just gets saved as a white background.
This is a basic question, so I am hoping there is a simple answer!
