[gdal-dev] FLIR thermal with embedded image

[Even Rouault]

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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