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Using gm is fun! Head over to the Extending gm page to see how to customize it.
ImageMagick and GraphicsMagick version notes
For tested versions and platforms as well as notes on differences can be viewed at GraphicsMagick and ImageMagick versions
In order to use GraphicsMagick on Heroku it is possible to use the following buildpack: https://github.com/mcollina/heroku-buildpack-graphicsmagick
If you want to use a newer version of ImageMagick, you can use the following buildpack: https://github.com/mcollina/heroku-buildpack-imagemagick