Rails - Jan 2009 - reprocess attachment_fu thumbnails with ImageMagick edits

I''m trying to modify product images when a user marks a product as
"sold" and I am able to modify the original image file successfully,
but when I try to reprocess the thumbnails, my ImageMagick
modifications don''t stick.  Here is what I''ve got going so
far:

def before_save
    if self.sold_changed? && self.sold?
      for photo in self.photos
        imagelist = Magick::ImageList.new
        imagelist.read(File.join(RAILS_ROOT, "public",
photo.public_filename), File.join(RAILS_ROOT, "assets",
"sold.png"))
        imagelist.flatten_images.write(photo_file)
        photo.save!
      end
    end
end

Does anyone know why calling ''photo.save!'' would discard my
ImageMagick changes?  When I try the same function without calling
photo.save!, my original image is modified exactly as I intend but the
thumbnails are not updated.

If anyone has a suggestion, please let me know.  Thanks in advance!
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