SVG (by Inkscape)
PNG (by Inkscape)
BMP (by GIMP) (8bits grayscale; 4階調化 (ポスタリゼーション))


ruby -rpp -e "$stdout.binmode; pp File.open('primitives.bmp', 'rb:binary') { |f| f.pos = 0x0436; f.read.unpack('C*').map{|n| n/0x55 }.each_slice(16).to_a.reverse.each_slice(16).to_a }"
