Philip (professional photographer with over 25 years of experience; official Adobe Ambassador for Australia) Andrews & Mark Galer 
Photoshop CS6: Essential Skills [PDF ebook] 

Combining real word examples, step-by-step projects and professional advice, Photoshop CS6: Essential Skills provides you with the ultimate learning experience. Written by two internationally recognized authors and Adobe Photoshop Ambassadors, this book and downloadable resource package gives you a guided tour of everything you need to know to master image editing and achieve stunning results.

Broken into three parts, this self-study guide to Photoshop covers all the foundation skills to get you started, before moving on to more advanced image editing and photomontage techniques to develop you skills even further. A complete section of step-by-step imaging projects and the 12+ hours of video tutorials on downloadable resources will hone your image editing skills to give you professional quality results.