Another quick little utility I wrote recently. This extracts covers from your epub files and can change the size, greyscale etc. By default it will greyscale and resize them, to work as screensavers for ebook readers.

• More info: http://pipasoft.com/epub-cover-extractor/
• Source code: https://github.com/brianpipa/epub-cover-extractor
• Latest compiled runnable version: https://pipasoft.com/downloads/epub-cover-extractor/

Sample image from an epub: