Thanks Oren that worked

Anyone interested can simply test by hitting the index on this
controller


class ThingsController < ApplicationController
  require 'rubygems'
  require 'RMagick'
  def index
    img = Magick::Image.read("#{RAILS_ROOT}/public/images/
rails.png").first.scale(5).to_blob
    render :text=>img, :status=>200,:content_type=>'image/gif'
  end
end

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