Hallöchen!
Stéphane Gimenez writes:
> Hi Gert,
>
> [...]
>
> [...] Unfortunately the corrections that are computed by lensfun
> contain "fuzziness" (they are kind of non-continuous due to big
> rounding errors), [...]
Could you elaborate on that? What is the source of those rounding
errors?
> [...]
>
> The general idea for the fitting hasn't changed, but you should
> notice improvements because the method for the evaluation of color
> shifts has changed. The fitting is now computed based on better
> estimations, with proper weighting. For example, a large
> pseudo-uniform blue sky does not have a bad influence on shift
> estimations.
Does this mean you could use your method to create an improved
stand-alone tca_correct?
> About the fitting itself, the applied red and blue color shift are
> resolved as 2-dimensional polynomials of degree 4 (hard-coded but
> can be modified in the source). That is, a sum of x^n*y^m
> components with n + m <= 4.
Is it really necessary to take non-radial components into account?
>From my experience with distortion, I can hardly imagine this.
> [...]
>
>> And would you consider adding a manual slider option or do you
>> use SVD for the fitting?
>
> I like the zero-configuration approach.
Me too. I hope that I convince the devs some day to reduce the two
TCA sliders to one.
Tschö,
Torsten.
--
Torsten Bronger Jabber ID: torsten.bron...@jabber.rwth-aachen.de
or http://bronger-jmp.appspot.com
------------------------------------------------------------------------------
Learn Graph Databases - Download FREE O'Reilly Book
"Graph Databases" is the definitive new guide to graph databases and their
applications. Written by three acclaimed leaders in the field,
this first edition is now available. Download your free book today!
http://p.sf.net/sfu/NeoTech
_______________________________________________
darktable-devel mailing list
darktable-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/darktable-devel
