Turns out we've also been bit by this problem... please see my
questions below.
On 2014-08-04 01:55, Heiko Oberdiek wrote:
On 04.08.2014 01:27, Gildas Hamel wrote:
I append the jpg file (tombe.jpg).
The resolution data in tombe.jpg are inconsistent:
* JFIF header: 72 DPI
* EXIF header: 300 DPI
What program did you use to determine this? I'm looking at one of
our jpgs in a text editor, and while I see the string "Exif" near
the top, I don't see any jfif-like string. GIMP reports 72x72 ppi,
but I don't know whether that's exif or jfif.
Apparently XeTeX uses the EXIF header, whereas xdvipdfmx the JFIF
header
(or vice versa).
Is there a work-around? Like using some image editor to produce a
jpg file with jfif and exif headers that agree on the resolution
(and I suppose have the correct one :-)), or maybe converting from
jpg to some other format? I suppose I could create a PDF using
pdflatex, and import that into my xetex file instead of the original
jpg. But before I try all these things, it would be nice to know if
someone else has found a work-around...
There is a tool named "exiftool" that can do this. It modifies image
metadata without changing the image itself. You can install it either
via a package manger (in Debian it's "libimage-exiftool-perl") or you
can install it via CPAN (the perl package manager, because it it part
of a perl package. If you use cpan, do:
cpan
cpan> install Image::ExifTool
The following two commands will set all resolution metadata known to
exiftool to 300.
exiftool -'*Resolution'=300 image.jpg
I haven't done a thorough testing of this tool, but for OP's image, it
worked. (The command might need some refinement, depending on your
needs.)
To just read all the metadata, do
exiftool -v image.jpg
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