in reply to I've muddled my bit and byte formats.

Your comment about TIFF inspired me to google that format. I found a warning that software to decode this format may require a license. Did you check out the built-in function 'vec'? The bits in your string are probably not in the order that you expect. You should be able to fix this with unpack. (pack/unpack are confusing, and working code probably cannot be ported to other systems).
Bill
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Re^2: I've muddled my bit and byte formats.
by hippo (Archbishop) on Oct 10, 2018 at 15:40 UTC
    I found a warning that software to decode this format may require a license.

    Please share the URL of this warning. It would be a public good to debunk it openly.

        Fortunately, the last of the LZW compression patents expired in 2004.