While Photoshop CS4 is about learning how to create and use special effects, according to the author, it is more about doing things other than photography, sharpening, camera raw, and all the other usual techniques you find in most Photoshop books. It is about learning the "other side" of Photoshop.
One thing to keep in mind is that Down And Dirty Tricks should be viewed as a cookbook and not an in-depth guide to each of these techniques. I have heard in the past where someone says that the book just tells you to put in values, but not why to pick those values? For example, in this book in one tutorial you are told "when the Gaussian Blur dialog appears, enter 9 pixels, then click OK to apply…" Sure, you are not told why 9 is the magic number, but this is no different than when you are making spaghetti sauce and you are told to put in an 8 oz can of tomato paste. If you want to try 6 go for it.
For me, the real purpose of Photoshop CS4: Down And Dirty Tricks is not to show you how to recreate the effects demonstrated here, although if you needed to, you have the steps. The real purpose is to show you the steps to recreate an effect. Then with an arsenal of techniques at hand, you can start putting your own techniques together to create your own style. In his intro, the author recommends that you work through each tutorial even though you may never use that technique. It is because of value of gaining this arsenal that I very highly recommend this book.
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