The Epson duplex scanners don't (unfortunately) report the fact that
they scan even pages upside down from the ADF. Their own software
(including the built-in scan to PDF on SD card function) flags the
rotated pages in the PDF so they display properly, but the raster is
actual stored bottom to top on alternate pages.
You can confirm this with a command like:
scanimage --format tiff --mode Binary --resolution 75 --scan-area
'Letter Portrait' --source 'Automatic Document Feeder' --adf-mode Duplex
--batch='duplex%d.tif' --progress
and every other TIFF file will be upside down, with no tags indicating
orientation. So this might have to be an explicit option.
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https://bugs.launchpad.net/bugs/1001208
Title:
gscan2pdf not recognising ADF duplex mode with Epson epkowa library
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