heya, On Thu, Sep 7, 2017 at 12:57 PM, Heiko Bauke <[email protected]> wrote: > Hi, > > Am 03.09.2017 um 13:46 schrieb Heiko Bauke: >> >> yes I just dropped the tonecurve information because this gave me the >> best results in some test cases. Investigating the source code of >> darktable-chart I realized that dropping the tonecurve information from >> the darktabe style is inconsistent with the way how data for the color >> lookup module is calculated. >> >> There is certainly some room for improvement for the way how I convert >> Hald CLUTs (http://www.quelsolaar.com/technology/clut.html) to darktable >> styles. > > I updated my film emulation styles to contain both a tonecurve and a color > lookup table. I also put the python script and all auxiliary files that > have been employed to generate the film emulation styles on github. For > those who want to play further with color looks there is also a script to > convert a cube file to a darktable style. All these Python scripts work > with the vanilla darktable-chart now. See > https://github.com/rabauke/darktable-styles/ > > Note that a darktable color lookup style contains not more than 49 color > patches (interpolation points), whereas a hald clut or a cube file may > contain 100s of colors. Thus a darktable color lookup table plus a tone > curve can give only a approximation to the effect of a hald clut file or a > cube color style.
awesome, thanks! the hope with the clustered fit would be that the lut is generally smooth enough to be represented with lower sampling density. did you look at the max delta E error (distance in Lab colour space)? darktable-chart outputs it somewhere in the process. if it drops below 2.0 it should not be visible (2 is the just noticeable difference). cheers, jo > > > > Heiko > > -- > -- Number Crunch Blog @ https://www.numbercrunch.de > -- Cluster Computing @ http://www.clustercomputing.de > -- Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke > -- Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke > ___________________________________________________________________________ > darktable developer mailing list > to unsubscribe send a mail to [email protected] > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to [email protected]
