require 'mini_magick'
module MiniMagickProcessor
  def image_to_tiff
    generate_uid
    tmp_file = Pathname.new(Dir::tmpdir).join("#{@uid}_#{@source.basename}.tif").to_s
    cat = MiniMagick::Image.open(@source.to_s)
    cat.format("tif")
    cat.crop("#{@w}x#{@h}+#{@x}+#{@y}") unless [@x, @y, @w, @h].compact == []
    cat.write tmp_file.to_s
    return tmp_file
  end
end