This looks like a bug in poppler.
pdfimages -f 1 -l 1 icse98.pdf x
creates x-000.pbm
display x-000.pbm
also shows the image flipped vertically.
** Package changed: gscan2pdf (Ubuntu) => poppler (Ubuntu)
** Changed in: poppler (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1217022
Title:
Gscan Mysteriously Flips PDFs vertically
Status in “poppler” package in Ubuntu:
Confirmed
Bug description:
I started with a PDF downloaded from
www.csc.ncsu.edu/faculty/anton/pubs/icse98.pdf and attempted to put
it through OCR.
Immediately on loading through File>Open the images from the PDF were
rendered with a vertical flip (as if this operation had been performed
on each page in Gimp).
Consequently it was unable to process the text at all.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: gscan2pdf 1.0.4-5
ProcVersionSignature: Ubuntu 3.11.0-3.6-generic 3.11.0-rc6
Uname: Linux 3.11.0-3-generic i686
ApportVersion: 2.12.1-0ubuntu2
Architecture: i386
Date: Mon Aug 26 18:10:38 2013
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
LANGUAGE=en_GB:en
TERM=xterm
PATH=(custom, no user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: gscan2pdf
UpgradeStatus: No upgrade log present (probably fresh install)
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