2019.01.12 19:09 "Re: [Tiff] tiffcp altering image contents (in contrast to what the manual says)?", by Bob Friesenhahn
I would be very grateful if somebody could shed some light onto this issue.
Are you able to supply 'tiffinfo' output for all of the input files and the output file?
It may be that the JPEG has been re-encoded.
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
Public Key, http://www.simplesystems.org/users/bfriesen/public-key.txt