Javier,
I've just added a commit in your pull request to replace your image with
a smaller one. I've started from autotest/gdrivers/data/jpeg/flir/FLIR.jpg
and then hacked record 2 of type 32 (FLIR_REC_CAMERA_INFO) with data at
offset 0xC7E + 1352 by replacing it by type 14 (FLIR_REC_EMBEDDEDIMAGE),
and then I copied & pasted the content of a 2x1 JPEG image at offset
0xC7E + 1352 + 32. This resulting image is of course non sensical, but
enough for our purposes.
Even
Le 02/02/2026 à 18:39, Javier Jimenez Shaw a écrit :
Hi Even
I was not able to achieve that, sorry. So finally I made the PR with
an original image.
If anybody has one image that works I can still replace mine.
Thanks
On Sat, 31 Jan 2026 at 03:20, Even Rouault
<[email protected]> wrote:
Javier,
What about the hard core GDAL contributor way of starting with a
small JPEG image and then adding the needed bytes with your
favorite hexadecimal editor :-) ?
Otherwise, still a bit of use of your hexadecimal editor, but just
to find out a couple offfset/lenghts, you may try the trick of
starting from an existing file, keeping the begin in a part, the
end in the other part, and omitting most of the embedded image
using a /vsisparse/ .XML file and replacing it with a
<ConstantRegion> at zero. Like
https://github.com/OSGeo/gdal/blob/master/autotest/gdrivers/data/grib/rotated_pole.grb2.xml
and then you use "/vsisparse/your.xml" as a valid JPEG dataset name.
Or variation of the above, perhaps a bit less convoluted, start
with your initial image, set to the zero byte unneeded ranges, and
zip it.
Even
Le 30/01/2026 à 10:43, Javier Jimenez Shaw via gdal-dev a écrit :
Hi
TL;DR: I need a "small" FLIR image file for a unit test in GDAL.
Do you have one?
I am working on GDAL's thermal jpeg code, to read an embedded RGB
image that some FLIR cameras are including inside the JPEG, in
addition to the thermal information/image.
I want to add a unit test with a real image, but unfortunately I
only have "big" images, around 4 or 5 MB.
It would be great if anybody has a smaller image that can be
included in the GDAL tests code (with the copyright/license
permissions that it has).
The model "FLIR T640" I think produces images of about 1.5 MB
only. But it can be other models as well.
To check if it has the Embedded Image, just run this:
exiftool -EmbeddedImage filename.jpg
If you see any output, please contact me.
Thank you!
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