[XeTeX] jpg image and text overlapping

[maxwell]

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...

    Mike Maxwell