I was looking for a practical guide to get into Photoshop, this book goes much further directly. I had hoped to find a "how to" simple first then refined for those wanting to go further but this is not the case, it's illico very detailed and very technical. This book is to be reserved for professionals who already have real experience of the Photoshop tool and want to know all the mechanisms in detail. So even if this work is of high quality, it did not respond to my expectations ... That said, describing "training manual for professionals in the image" was clear but I have not been attentive enough and probably somewhat optimistic. I did not give up much but at first, I learned more through tutorials on the Web than through this brick not really easy to digest for the uninitiated.