I've just uploaded RMagick 1.15.1 to RubyForge. This release fixes a problem that broke compatibility with ImageMagick 6.0.6 and ImageMagick 6.0.7, and possibly other very old releases of ImageMagick. If you have already installed RMagick 1.15.0 you don't need to install this release.
RMagick is available as always from RubyForge:
http://rubyforge.org/projects/rmagick/. The RMagick home page is
http://rmagick.rubyforge.org. The RMagick installation FAQ is at
http://rmagick.rubyforge.org/install-faq.html.
RMagick is an interface to the ImageMagick (www.imagemagick.org) and
GraphicsMagick (www.graphicsmagick.org) image processing libraries.
RMagick supports more than 90 image formats, including GIF, JPEG, and
PNG. RMagick comes with comprehensive HTML documentation.