Hi, Seems as though the pink colours appear in my image when I disable 'highlight reconstruction'. With this disabled the Green & Blue channels have a lot less data in the highlights than the red. Enable highlight recon, and it seems to scale all the RGB to a simple range.
Odd, because I do not get this pink appear when I reduce the highlights in Lightroom... and I am still using this same .dng file. Chris On 2018/04/08 05:34 PM, Guillermo Rozas wrote: > It may be truth (we need a developer to confirm), but in this case it > seems to be working like I say. Try it: > - open a picture > - over-expose it with the Exposure module > - try to recover using the shift white point slider on Shadows and > highlights. > Doing that, I lose all detail in the highlights. At some points in the > pipeline there are color space transformations, and that may clamp the > values to the limits to avoid problems (total speculation) > Regards, > Guillermo > > On Sun, Apr 8, 2018 at 8:17 PM, Robert Bieber <[email protected] > <mailto:[email protected]>> wrote: > > Don't quote me on this, but since the pixel values are all floats > I'm pretty sure it's possible for one module to push them beyond > the "maximum" values and another one to bring them back in with > the detail still there, as long as everything ends up within the > allowable bounds by the time it gets converted to int > > > On 04/08/2018 07:11 PM, Guillermo Rozas wrote: >> Can you provide the original DNG so people can play with it? >> >> One think you should take into account is that modules in >> Darktable are applied in a certain order (bottom to top on >> darkroom). In particular, "Exposure" and "Base Curve" come before >> "Shadows and highlights". So, if Exposure pushes the info of the >> sky past the white point, you can not get it back later (at least >> that's how I understand it). Going by the histogram, it looks >> like this is what happening to your picture (there are a lot of >> pixels close to the right edge): the info was there before the >> exposure (and base curve) modules, but not by time you get to the >> shadows and highlights module. >> >> Two tips I can give you: >> - check the RAW over-exposure indicator (small colors icon below >> and to the right of the picture in darkroom). If the area is >> really non-recoverable it will show as over exposed in RAW. If >> not, there is a way to recover it (not always easy, but the info >> is there) >> - my first step when editing complex pictures is to use the >> exposure and black sliders on the Exposure module to fit the data >> exactly inside the histogram (using the normal under/over >> exposure indicator). Then I know I'm working with almost all the >> info the file have. >> >> Best regards, >> Guillermo >> >> On Sun, Apr 8, 2018 at 7:04 PM, Peter Cripps >> <[email protected] <mailto:[email protected]>> wrote: >> >> I've seen similar results to Chris. One of the (few) things >> that I've found Lightroom does better than darktable is >> highlight recovery. >> >> I have noticed that the darktable histogram doesn't seem to >> show content at the far right hand side that does show in the >> Lightroom histogram. Don't know if this is relevant. >> >> I hesitate to mention this, since I'm very conscious of the >> fact that darktable is entirely created by people working on >> their own time. It seems ungrateful to pick out one thing >> that isn't perhaps as good as with other paid programs. >> >> Peter >> >> >> >> >> On 04/08/2018 02:51 PM, Chris wrote: >>> >>> Hi, >>> >>> So the shadows & highlights module also does not seem to >>> full 'reveal' the detail in the clouds that I know exists... >>> it simply darkens the existing pixels that we can already >>> see. So not really 'recovering detail' as such. >>> >>> https://www.dropbox.com/s/u3lo4oy9dokdbwh/darkt_04.jpg?dl=0 >>> <https://www.dropbox.com/s/u3lo4oy9dokdbwh/darkt_04.jpg?dl=0> >>> >>> and pushed further >>> >>> https://www.dropbox.com/s/zih4f434frcxizu/darkt_05.jpg?dl=0 >>> <https://www.dropbox.com/s/zih4f434frcxizu/darkt_05.jpg?dl=0> >>> >>> obviously I am going to extremes here... but they still just >>> do not compare to the clarity revealed from LR. >>> >>> https://www.dropbox.com/s/suw9v3jnsszbsec/lr_02.jpg?dl=0 >>> <https://www.dropbox.com/s/suw9v3jnsszbsec/lr_02.jpg?dl=0> >>> >>> Thanks, >>> >>> Chris >>> >>> >>> On 2018/04/08 02:30 PM, Pascal Obry wrote: >>>> Le dimanche 08 avril 2018 à 14:25 -0700, Chris a écrit : >>>>> Anyway, these are my adventures into highlights in DarkTable. >>>> You haven't activate the "shadows & highlight" module, so indeed >>>> nothing done for darktable :) >>>> >>> >>> >>> >>> ____________________________________________________________________________ >>> darktable user mailing list to unsubscribe send a mail to >>> [email protected] >>> <mailto:[email protected]> >> >> >> >> ____________________________________________________________________________ >> darktable user mailing list to unsubscribe send a mail to >> [email protected] >> <mailto:darktable-user%[email protected]> >> >> >> >> >> ____________________________________________________________________________ >> darktable user mailing list to unsubscribe send a mail to >> [email protected] >> <mailto:[email protected]> > > > > ____________________________________________________________________________ > darktable user mailing list to unsubscribe send a mail to > [email protected] > <mailto:darktable-user%[email protected]> > > > > ____________________________________________________________________________ > darktable user mailing list to unsubscribe send a mail to > [email protected] ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to [email protected]
