Hallöchen!
Gert van der Plas - Schrama writes:
>> Is it really necessary to take non-radial components into
>> account? From my experience with distortion, I can hardly
>> imagine this.
>
> Not sure, but I would expect tilt and shift lenses, adapter
> mounted lenses to need translational and skewed components. As
> well as wacked lenses with some defects ;-) A toggle for those
> might be a nice option. Or allow choosing cross-components orders
> and non-cross-component orders ;-)
Well, after having measured TCA for dozens of lenses now, I'm
surprised at the complexity of your model. In fact, the full
polynomial of tca_correct uses to give me worse results than the
simple linear model realised by Darktable's TCA sliders.
tca_correct may yield sub-optimal results, but the linear results
are often really pleasing.
Then, when I read about 4th order polynomials with mixed terms, I'm
really tempted to call this over-engineered. ;-) That said, I like
an automatic approach -- Adobe had good reason to abandon
profile-based TCA correction.
By the way, does Stéphane Gimenez read this list? I didn't have him
on CC.
Tschö,
Torsten.
--
Torsten Bronger Jabber ID: torsten.bron...@jabber.rwth-aachen.de
or http://bronger-jmp.appspot.com
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