deskew.lua
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	-- FIXME this should do the right thing for grayscale images:
	-- threshold, compute rotation, then rotate the grayscale image

	if #arg < 2 then
	print("usage: ... input output")
	os.exit(1)
	end

	proc = ocr.make_DeskewPageByRAST()

	input = bytearray:new()
	output = bytearray:new()
	iulib.read_image_gray(input,arg[1])
	proc:cleanup(output,input)
	iulib.write_image_gray(arg[2],output)