On 09.01.2016 09:21, Roman Lebedev wrote: > On Sat, Jan 9, 2016 at 1:49 AM, gersch...@gmail.com <gersch...@gmail.com> > wrote: >>>>>>> blue colors in the raw files of my Canon 700D are turned into much >>>>>>> darker blue or purple >>>>>>> in darktable when applying the usual corrections (sharpen, orientation, >>>>>>> base curve). The >>>>>>> jpg files produced by the camera show a blue which is much closer to >>>>>>> the real color. >>>>>>> Is this a known problem? What Is the best way to correct this? I have >>>>>>> the impression >> that >>>>>>> this does not occur in rawtherapee. >>>>>> >>>>>> Yeah, this problem has been present for quite some time. I see it in >>>>>> shots taken with >> my Canon 60D >>>>>> but not in those taken with my 5d3. It's cased by the input color >>>>>> profile; try >> changing the profile >>>>>> from "enhanced color matrix" to "standard color matrix" or even >>>>>> "rec2020". >>>>>> >>>>>> The ultimate solution is to profile your camera using a color target: >>>>>> >>>>>> https://encrypted.pcode.nl/blog/2010/06/28/darktable-camera-color-profiling/ >>>>>> >>>>>> Darktable used to accept these custom profiles for inclusion in the main >>>>>> project, but >> this is >>>>>> currently not happening pending a rework on the way the input end of the >>>>>> pipe works >> (though I don't >>>>>> remember the details). None of this stops you using your own custom >>>>>> profile, though. >>>>> >>>> >>>> Thanks for your information. I've tested different input color profiles >>>> but I still have >>>> the impression the blue is too saturated. >>>> Is there someone with a Canon camera who would share their optimised color >>>> profile or >>>> darktable style? >>> Have you already tried setting "gamut clipping" in "input color >>> profile" to "linear Rec2020 RGB"? >> >>> https://www.darktable.org/usermanual/ch03s04s03.html.php#d0e7524 >> >>>> Thanks also for the hint to try RawStudio profiles. >> >>>> Regards, Gerd >>> Roman >> >> Hi, >> yes, I tried Rec2020 RGB with gamut clipping but now all colors look rather >> pale. I think >> that the colors in the standard color matrix look good except the blue being >> too dark. > Just to be sure: i meant: in "input color profile" module, set "gamut > clipping" to "linear Rec2020 RGB". > Not: in "input color profile" module, set "profile" to "linear Rec2020 RGB". > >> Regards, Gerd > Roman.
Hi, I've actually found a photo where the blue color situation of Canon raw files can be seen very well: Have a look at https://www.dropbox.com/s/8ikzw34pcvpstqf/IMG_7993.CR2?dl=0 https://www.dropbox.com/s/ykhmyu12c9o89sa/IMG_7993.JPG?dl=0 The real color of the shirt is very close to the blue in the JPG but it appears to be purple in the raw image if the standard base curve is applied. The setting suggested by Roman improves the color a bit but not enough. Regards, Gerd ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Darktable-users mailing list Darktable-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-users
