Create CD/DVD image with Mac OS X Tiger

As a former Windows user i tryed the sama approach when needed to copy an audio CD. But it turned out that Disk Utility (OS X default bundle) is only capable to write images to CD/DVD. So how can I make image out of CD/DVD. There http://www.slashdotdash.net/articles/2006/08/14/create-iso-cd-dvd-image-with-mac-os-x-tiger-10-4 is quite good tutorial for that.