On Mon, May 18, 2015, at 11:29, Matthieu Moy wrote: > * TCA correction in "lens correction". This one uses a lens database > (lensfun) and knows what the TCA of your lens is from this database. > It applies the reverse transformation to realign the color channels. > In my experience, this is the best option if your lens is known (and > otherwise, have it calibrated: http://wilson.bronger.org/calibration) > > This module comes after "chromatic aberration" in the pipeline, so > activating both is usually not a good idea, you may overcorrect the > aberration.
Also worth noting is that if you're using the lens correction module anyway, for other corrections, you may be better off making the TCA corrections manually in that module even if there isn't TCA correction data for your lens, since I *believe* the lens correction module is smart enough to combine all corrections into one interpolation operation, which would preserve image quality compared to doing it twice, separately. Someone correct me if this isn't actually how it works... -- junkyardsparkle ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
