Creating a slide show using tkinter

In this recipe, we will create a nice working slide show GUI using pure Python. We will see the limitations the core Python built-ins have, and then we will explore another available third-party module called Pillow, which extends the built-in functionality of tkinter in regards to image processing.

While the name Pillow might sound a little bit strange at first, it actually comes with a lot of history behind it.

For GUIs and images, the older line of Python 2 has a very powerful module named PIL, which stands for Python Image Library. This library comes with a very large amount of functionality, which, several years after the very...