Similar questions and answers abound here on StackOverflow There may be other ways such as using pngtopnm or dividing bits by 17 but life is short. Having tried multiple combinations in GhostScript, I have to say when I did get anywhere near just gray the results were still 8 bit (see kens comment below) and thus less than desired, however some scriptable graphics apps use GhostScipt or other PDF handlers that then can batch convert a list using a settings file.
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