Chapter 3. Encoding Secret Messages with Steganography

We're going to acquire intelligence data from a variety of sources. In the previous chapter, we searched the WWW. We might use our own cameras or recording devices. We'll look at image processing and encoding in this chapter.

To work with images in Python, we'll need to install Pillow. This library gives us software tools to process image files. Pillow is a fork of the older PIL project; Pillow is a bit nicer to use than PIL.

Along the way, we'll visit some additional Python programming techniques, including:

• We'll review how Python works with OS files and also look at some common physical formats, including ZIP files, JSON, and CSV.
• We'll introduce JPEG files and learn to process them with Pillow. We'll have to install Pillow before we can make this work.
• We'll look at several image transformations, such as getting the EXIF data, creating thumbnails, cropping, enhancing, and filtering.
• We...