[Darktable-users] Adobe LCP profiles in Darktable

[Torsten Bronger]

Hallöchen!

Darktable uses the Lensfun library for lens correction.

The Lensfun repository now contains a branch "acm" which implements
the Adobe Camera Model for distortion (including fisheye), TCA, and
vignetting. Moreover, it contains a script that converts LCP files
into Lensfun XML. It merges the two data sources, so you get one
big database. It can even combine LCP and Lensfun correction for
the same lens model. You may compare
http://wilson.bronger.org/lensfun_coverage.html with
<http://wilson.bronger.org/lensfun_coverage_lcp.html>. See
http://wilson.bronger.org/lensfun/lensfun-convert-lcp.html for more
information.

You can clone the git branch with

git clone -b acm git://git.code.sf.net/p/lensfun/code lensfun-acm

or download a tar ball with

wget http://wilson.bronger.org/lensfun-acm.tar.gz

This Lensfun will print on stdout whether an "acm" model was used
for correction, so that you know whether LCP or Lensfun data is in
action. Please give us feedback about the functionality and
accuracy so we can evaluate this possible addition. If you have
access to a Lightroom or Photoshop version, please try to compare
the results. You may use Lensfun's bugtracker for feedback. Thank
you!

Tschö,
Torsten.

[Michael Born]

This sounds amazing. Thank you for your work.

Then, DT has a more complete database for lenses then the commercial
counterparts :-)

Cheers,
Michael

[Robert William Hutton]

And Lensfun's profiles are generally more accurate than Adobe's, so where possible it's better to
use those. But if there's no profile for your lens already in Lensfun, this could be useful.

Regards,

Rob

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This sounds amazing. Thank you for your work.
Then, DT has a more complete database for lenses then the commercial
counterparts :-)
Cheers,
Michael
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[Torsten Bronger]

Hallöchen!

Post by Robert William Hutton
And Lensfun's profiles are generally more accurate than Adobe's,
so where possible it's better to use those. But if there's no
profile for your lens already in Lensfun, this could be useful.

The conversion script gives LF higher precedence, unless you pass
the --prefer-lcp option.

Tschö,
Torsten.

[Torsten Bronger]

Hallöchen!

Post by Michael Born
[...]
Then, DT has a more complete database for lenses then the commercial
counterparts :-)

That's true, but these days, there's more than lens profiles for
compensating lens errors. The Adobe database doesn't contain any
profiles for µ4/3 lenses, neither does it for Fujifilm X mount
lenses. These lenses place their correction parameters into the RAW
file, and Lightroom uses them directly. Given that such techniques
will become more wide-spread in the next years, this is the next
challenge for free RAW software.

Tschö,
Torsten.

[Torsten Bronger]

Hallöchen!

[...] These lenses place their correction parameters into the RAW
file, and Lightroom uses them directly. Given that such
techniques will become more wide-spread in the next years, this is
the next challenge for free RAW software.

... in the field of lens correction, of course.

Tschö,
Torsten.