I would just like to thank the developers for another great development of
DT. After reading this post I see more capabilities in the lens correction
module than I realised existed. It is time to read that section of the
manual again. I also note that some cameras only have the option of lensfun
while others have the choice of lensfun or embedded. Which would normally
be the best option or does it vary between images?
thanks,
Terry
On Sat, 24 Dec 2022 at 01:39, Marc Cabuy <[email protected]> wrote:
> Hello DEAR dt USERS,
>
>
>
> I am testing the enhanced “Lens Correction” on my Fujifilm files. The
> older (also mirrorless) camera’s aren’t dealt with for “embedded metadata”
> to correct lens distortions (etc.), but “lensfun” does still fine.
>
>
>
> But it works for my more recent Fujifilm X-T4, and there I can select in
> “Lens Correction” between “lensfun” or “embedded metadata”.
>
>
>
> Hence it’s how Remco describes it: for some camera models it will work,
> for others not.
>
>
>
>
>
> And DEAR DEVELOPERS, TESTERS, DOCUMENTERS and TRANSLATORS,
>
>
>
> I highly appreciate this and the further great new capabilities in dt.
>
>
>
> Thank you (again),
>
> Marc.
>
>
>
>
>
>
>
> *Van: *Remco Viëtor <[email protected]>
> *Verzonden: *vrijdag 23 december 2022 11:01
> *Aan: *[email protected]
> *Onderwerp: *Re: [darktable-user] darktable 4.2.0 released
>
>
>
> On vendredi 23 décembre 2022 08:48:01 CET Jan Ingwer Baer wrote:
>
> > I have tried to look into the source, but i am lost and could not find
>
> > where the information is extracted/decoded from the RAW-file EXIF data
>
> > to get a guess for which cameras the RAW-file EXIF lens-distortion data
>
> > are supported.
>
> You may have to look at Exiv2 information to find that: afaik, all
> metadata
>
> handling is done through Exiv2. And that kind of metadata is usually in
> the
>
> makernote section, which is "rarely" documented...
>
>
>
> So if Exiv2 isn't capable of decoding the relevant part of the makernote,
>
> darktable will have no information to work with. As exiv2 is an external
>
> library, the set of supported cameras can change w/o warning.
>
>
>
> I haven't found a list of "supported cameras" on the Exiv2 site. Not
>
> surprising: when is a camera supported? Very few makernotes are fully
>
> understood. And the makernote support can vary between models of the same
>
> brand (and perhaps even between firmware versions of a given model?).
>
> But perhaps try this page: https://exiv2.org/metadata.html
>
>
>
>
>
>
>
>
>
>
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