Gscan Mysteriously Flips PDFs vertically

[Cefn]

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)

[Jeffrey Ratcliffe (jeffreyratcliffe)]

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.