Lately I have been participating in a writing project that involves RMagick. I have been using RMagick for a while now and I highly reccomend it. I will give out some more details about the project in the future, but for the moment I just want to give props to Tim Hunter for his great job with interfacing Ruby with ImageMagick and GraphicsMagick.
Antonio Cangiano is a Software Developer and Technical Evangelist at IBM. He authored 'Ruby on Rails for Microsoft Developers' by Wrox (2009) and 'Technical Blogging' by The Pragmatic Bookshelf (2012). You can follow him on Twitter.