Download GIMP from :
[url removed, login to view] (Links to an external site.)
and save some images of your choice. Use GIMP to perform some image processing operations in Chapter 9 of your text and submit the original image and the processed image. Do as much as you'd like for lots of extra credit - plus you'll have a lot of fun.
Do some histogram equalization operations on a bad image (dark or foggy) and see if you can enhance it a lot!