Hallöchen! Stéphane Gimenez writes:
> [...] > >> You have to set the "component roles" of the pixels properly, see >> http://lensfun.sourceforge.net/manual/group__Correction.html#gaf7c5a3f809c2245211b9f50797b718b3 >> In your configuration, Lensfun assumes R,G,B tripletts, thus you >> see discontinuities after every three values. If the image is >> already demosaiced, this makes sense, because then, Lensfun >> assumes the same x,y coordinates for every colour component. > > This is only used for lf_modifier_apply_color_modification > (vignetting) not for > lf_modifier_apply_subpixel_geometry_distortion (distortion, which > is the problematic one, and CA). Oh, my bad. Still, they are not rounding artifacts but the result of the grouping of RGB tripletts plus the assumption that they share the same coordinate on the sensor. I cannot say more because I haven't really understood how you got those values. > [...] > >> Nice! I don't like tca_correct very much. However, it should be >> possible -- at least as an option -- to use Lensfun't model for >> the fitting, see >> <http://lensfun.sourceforge.net/calibration-tutorial/lens-tca.html>. > > A (radial) degree 4 polynomial :-) * Lensfun always sets a = 0 * No mixed terms * In most cases, also c = 0 * In 50% of the cases, only v != 0 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
