Chris,

> using Exiftool I've tried writing to the header in each JPG like so:
> exiftool -ExposureTime='1/5' image_1.jpg
>
> However I continue to get the same exposure errors. Is there more that I
> need to add into the Header?

hdrgen need the following info:

- ExposureTime
- ISO
- FNumber

If it still fails, try writing the ExposureTime as floating-point seconds; but I think fractions are fine.

Axel


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