Sayood is a lot better at explaining things that are relatively new to him (e.g. the Burrows-Wheeler transform) than things that have been second nature for decades; I don't care what your academic background is, introducing run-length encoding through Markov chains is pretentious as all hell. Still, a thorough overview of data compression (both lossless and lossy) and its applications. While it's less accessible than, say, The Data Compression Book, it covers all of that book's ground and much, much more.
This book gave a very nice introduction on the topic of compression. I can highly recommend it if you are new to the subject, have some mathematics background and would like to know more about the innerwortkings of data compression
To be completely honest I haven't read this cover to cover, some parts are approached from the worst angle possible and I made the choice to supplement it by watching YT explanations... Still, a more-than-sufficient intro into data compression.