Here's just one of the many examples out there of how to code a plugin for 
CarrierWave:

http://www.freezzo.com/2010/12/23/create-ffmpeg-processor-for-carrierwave-in-rails-3/

Personally, I find the tooling around Paperclip to be a lot more hackable in 
this regard. The thumbnail processor can be duplicated in place, modified with 
different command-line arguments, and used as a different "style" in the 
collection. It helps that Paperclip does their own thumbnail as a plug-in, so 
you're on a par with the core functionality.

Walter

On Apr 9, 2014, at 7:55 PM, Eric Kornmeyer wrote:

> I'm creating a project that lets users upload images onto products and
> then buy the products. I'm using Carrierwave and Minimagick. I found
> this cylnderize script on fmwconcepts. It's a shell script. It is
> literally perfect for what I need as a lot of the products are mugs.
> Does anyone know how I might be able to convert the script into
> minimagick code I can use in my controller?
> 
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