[Bug 764093] tag: exif: wrong parsing of ISO_SPEED and PHOTOGRAPHIC_SENSITIVITY tags

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764093

--- Comment #10 from Thiago Sousa Santos <thiagossantos at gmail.com> ---
(In reply to Paulo Neves from comment #9)
> I think the 0x8827 should never be dependent on anything. Because in
> previous standards it was a standalone tag. It's true that the REI and
> derivatives seem to be different names for ISO so the problem becomes one of
> collision rather than continuing to make the 0x8827 dependent on 0x8830.

In case it had no 0x8830 we could just use 0x8827 as ISO as before but this
file has also the 0x8830. So the question here is if we want to differentiate
all of those values of 0x8830 into different tags or just map them to ISO. I
don't have enough photographic sensor knowledge at the moment to decide that.
Maybe someone out there has? 

> 
> For the sake of your argument then, which one will become the ISO value,
> 0x8832 or 0x827, because they both appear in the same image at the same
> time, and it is not guaranteed they are the same.

No, it is not. In that case we can either put both in the tags as a list or
just pick our favorite. Not sure what is the less worse option.

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