[darktable-user] darktable 4.2.0 “Lens Correction” how it works

[Marc Cabuy]

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 Verzonden: vrijdag 23 december 2022 11:01 Aan: darktable-user@lists.darktable.org 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         ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org     ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org