On Thu, Jun 26, 2014 at 1:21 PM, Francisco Cribari <[email protected]>
wrote:
> 1) Has anyone reverse engineered the Nikon Picture Control settings
> (standard, portrait, neutral etc.) in order to produce corresponding
> Darktable styles?
>
i had a look at this some time ago but stopped working on it.
the approach was to use some non-linear optimization to guess parameters
for dt's pipeline to mimick the raw->jpg mapping that each one of those
styles produces. i used basecurve, tone curve, color zones, and color
correction (all pixel local operations) in the process.
it turns out these styles are probably implemented with some look-up table,
even using three instances of color zones (each selecting by a different
component) did only match in 95% of the cases. it seems the mapping needs
to be more general (i.e. use conditional blending, or select color shift
not only based on one of LCh, but all three at the same time).
i guess trying again with conditional blending might be a good route to go.
just extracting and using the LUT itself as a static thing is not really
interesting IMHO, as you would not be able to fine-tune it later on. this
would be a `take it or leave it' situation, much like the choice you have
already (use jpg vs. use raw).
that said, where the output space of darktable's modules was large enough
to include the style, the fitting was working really well.
-jo
>
> 2) When using a drawn mask in a Darktable module that has presets one has
> to first apply the preset and then select the mask (blend -> drawn mask).
> It would be nice if we could also do that in reverse order: first select
> the mask and then apply the module preset. Can that be done? (For instance:
> first select the mask and then apply the equalizer clarity subtle preset.)
>
> Thank you. FC
>
>
> --
> Francisco Cribari, email: [email protected] - "All theory, my friend, is
> grey, but green is life's glad golden tree." --Goethe (Faust)
>
>
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Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft
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