Professional Web Design: Techniques and Templates is written for beginners and intermediates. First of all I have to mention that this book is kind of dated. The book was published in 2008, but it must have been early in the year. I think much of the technology that is discussed is old and out of date. The author does have a newer version of this book and I would suggest looking at that version instead.
While someone familiar with design and image formats may find some of the information boring, it could be useful to someone who has no experience in that area.