A great resource for the ambitious GM. Although I don't have a lot of knowledge of Photoshop, it was no problem for me to follow the helpful instructions of this book. But the great thing is that the author helps the reader achieve the same results with XARA Photo - and Graphic- Designer 9 or GIMP or Inkscape or Illustrator. So you don't necessary need to have such a powerful software! And there is a lot to learn, like depth in water, cliffs, forest paths, cobblestone, dungeons, top view of objects, villages, ship decks, regional maps (!) and much more - 25 tutorials to be precise. This is great and as a beginner like me you often are astonished of how easy it is to create certain beautiful and realistic effects. I heartily recommend this to any GM who has a very basic understanding of the aforementioned graphic programs and dreams of creating his own maps to visualize his world!