Convert animated gif to one image with Rmagic (image magic)

Question

I know there is a way to convert several images to gif animation with Rmagic, however I want to do the opposite. When uploading an animated gif, I want it to be non-animated, how can I do that ? (single/any image from image stream is good enough)

I'll use this as a part of carrierwave with Rmagic reprocessoring on thumbnails

Answer 1

from https://stackoverflow.com/a/13441569/473040

class DocumentUploader < CarrierWave::Uploader::Base
include CarrierWave::RMagick
#...

    version :thumb do
      process :remove_animation
      process :resize_to_fill => [300,200]

      #....
    end    

    def remove_animation
      # this will keep only first image of animated gif
      manipulate! do |img, index|
      index == 0 ? img : nil
    end

end

thx Padde and Tiago Franco