Here's an example of how to do what you want with Rmagick (probably works in
principle with mini magick, but not sure):

http://github.com/kete/kete/blob/3ae3c179f86943ccccaf5a15d8b5590a28c0ae6e/lib/resize_as_jpeg_when_necessary.rb

It's a module we mix in to monkey patch (i.e. redefine methods locally)
attachment_fu's built in processor code for Rmagick in the Kete app (
http://kete.net.nz).

Cheers,
Walter

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