Adobe Photoshop, version 4.0.

"...designed for users at many levels. If you're new to Adobe Photoshop, you'll learn all the important fundamental concepts and features you'll need to know to master the program. If you've been using Adobe Photoshop for a while, you'll find [this book] teaches many advanced features including tips and techniques that are included with the latest version of Adobe Photoshop"--P. 1.