2020.03.16 17:56 "[Tiff] Old-Style JPEG Support", by Levi Wilson

2020.03.16 20:43 "Re: [Tiff] Old-Style JPEG Support", by Bob Friesenhahn

./tools/tiffcp -c jpeg old-style-jpeg.tif modern-jpeg.tif
TIFFReadDirectory: Warning, Unknown field with tag 32931 (0x80a3) encountered.
TIFFReadDirectory: Warning, Unknown field with tag 32934 (0x80a6) encountered.
OJPEGSetupDecode: Warning, Depreciated and troublesome old-style JPEG compression mode, please convert to new-style JPEG compression and notify vendor of writing software.
OJPEGReadHeaderInfoSecStreamSof: JPEG compressed data indicates unexpected subsampling values.
/sandbox/02f04c98-48c7-4720-bfe7-b7ca2073c052_files: Error, can't read scanline 0.

So it sounds like what you'd described below in that this really old JPEG format was just unavailable

This might be a different error since it is a different error message. Perhaps it is an incorrectly specified parameter in the TIFF file.

What does

   tiffinfo old-style-jpeg.tif

report?

If the underlying problem can be understood and fixed, then it would be good to fix it.

Bob
--
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt