Rails - Sep 2009 - converting gif images to png images on the fly for PDF generation

I have been using the prawn library + prawnto plugin to generate PDF files
from a set of models. each model has one or more images associated with it
and I include each of these images into the pdf by looping through the
images collection associated with the model. (the images have been uploaded
with paperclip.)
Prawn does not support pdf generation from GIF - only jpg or png. is there a
way for me to check if an image is a gif and convert it on the fly into a
png image in my prawnto view?
I guess converting the image into a png while uploading would also work but
as I have a bunch of GIFs already uploaded, and Prawn throws up an "image
file is an unrecognised format" when generating the PDF from those models,
I
would appreciate a solution where the image is converted into a png and
included into the pdf.
my prawn view: (there are a bunch of cards - each card has a message and 0-n
images)
@deck.cards.each do |card|
 pdf.start_new_page
 pdf.text sanitize(card.message),:align => :center, :size => 30, :style
=>
:bold
 card.images.each do |pic|

  pdf.start_new_page
  picture = "#{RAILS_ROOT}/public#{pic.data.url}".sub!(/\?.+\Z/,
'''')
  pdf.image picture, :position => :center, :vposition => :center


 end

end

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