I've just uploaded a new RMagick gem for Windows to RubyForge. This gem contains RMagick 1.15.12 and is bundled with ImageMagick 6.3.7-8 Q8.
See the ChangeLog for a the list of bug fixes included in this release.
RMagick 1.15.12 for Windows is available as always from RubyForge: http://rubyforge.org/projects/rmagick/. Please wait a few hours for the mirrors to catch up.
Here are the Release Notes:
WIN32-ONLY: The rmagick-win32 gem is for Win32 installations. If you want to install RMagick on some other O/S, use the plain rmagick gem.
PREREQUISITES: This gem is bundled with a version of ImageMagick that must be used with this version of RMagick. Do not install a different version of ImageMagick.
INSTALLATION: This gem may not be installed remotely. Download the zip file and unzip it into a temporary directory. Then follow the instructions in the README.html file to install both ImageMagick and RMagick.
RMagick is an interface to the ImageMagick (www.imagemagick.org) and GraphicsMagick (www.graphicsmagick.org) image processing libraries. RMagick supports more than 100 image formats, including GIF, JPEG, PNG. The rmagick-win32 gem includes comprehensive HTML documentation.
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RMagick: http://rmagick.rubyforge.org/