I bought this book at Barnes & Noble about six months ago for the lofty price of $8 ($7 and some change actually). It was in the markdown section. I then found it at Half Price Books for $6 and I kicked myself.
I too enjoyed reading Programming Web Graphics. I must say that I learned quite a bit about the primary file formats used on the internet.
While this book is filled with useful information, a good portion is out of date. Some of the modules mentioned are deprecated (GIFGraph for example). It seemed to focus on creating GIFs with GD (GD no longer creates them). I am probably leaving something important out too.
I have to concur with davorg on this one... if you have not already purchased Programming Web Graphics, then get Perl Graphics Programming instead.
Updated: fixed a typo, and reworded one sentence.