The installation prerequisites for this chapter are same as the ones in Chapter 2, Working with Images. Please refer to that chapter for further details.
It is important to download all the images required for this chapter from the Packt website at http://www.packtpub.com/. We will be using these images throughout this chapter in the image processing code. Additionally, please download the PDF file, Chapter 3 Supplementary Material.pdf from Packt website. This is very important if you are reading a hard copy of this book which is printed in black and white. In the upcoming sections such as "Tweaking Colors", we compare the images before and after processing. In the black and white edition, you won't be able to see the difference between the compared images. For example, the effects such as changed image color, modified contrast, and so on, won't be noticeable. The PDF file contains all these image comparisons. So please keep this file handy while working...