Correction: it obviously varies with ISO /and/ some other variables. Op zo 15 mei 2016 om 17:10 schreef Martijn Kruiten <mart...@kruiten.nl>:
> Your blackpoint was not the same as the value that was reported in the > Google Groups issue. I changed it to be the same and that fixed it, so > that's definitely where the issue is ( > https://www.dropbox.com/s/d3h5uwwoj7xe4w7/DSCF3831-Darktable_blackpointfix.png?dl=0 > ). > > Quote from the group: > > "Camconst.json cannot help with BL because it is not steady in every ISO > but varies depending on other settings (exposure time should be one), > sensors temperature etc. > > I converted the samples provided (see forum link) to DNG and there one can > see that while the first 3200ISO sample (DSC3831) has BL 253-258-258-253 > the other two samples at 3200ISO have BL 251-260-260-251, 251-263-263-250 > (channel order is R-G1-G2-B) .." > > So the blackpoint varies with ISO and maybe some other variables and > should be read out for each image independently. > > Regards, > > Martijn > > Op zo 15 mei 2016 om 16:43 schreef johannes hanika <hana...@gmail.com>: > >> well, we're not using dcraw and the black point (as you can see in the >> screenshot) is the same as the one in the google groups issue you >> posted after the fix. possibly the black point is a red herring here. >> >> j. >> >> On Mon, May 16, 2016 at 2:32 AM, Martijn Kruiten <mart...@kruiten.nl> >> wrote: >> > Hi Johannes, >> > >> > I only pushed a few stops to exaggerate it. I'm seeing green shadows >> even in >> > well lit daylight ISO 1600 shots without exposure compensation, but i >> felt >> > this image could demonstrate it much better. Also, in your screenshot >> the >> > shadows are still green, just less obvious because they are darker. >> They are >> > not green in Adobe Camera Raw, DxO and Aperture and they aren't in >> > RawTherapee either, all at default settings, white balance as shot, >> exposure >> > compensation set at any value, camera profile set to any profile. I >> added a >> > Camera Raw sample to the Dropbox folder as an additional sample. If it's >> > just a limitation of the way Darktable processes these images, so be >> it, but >> > to me it seems very much like the issue RawTherapee had in 2013. Sadly >> I do >> > not have a sample of the old RawTherapee picture anymore. I'll check if >> I >> > can download an older version. It was just as bad as it is in Darktable >> now. >> > There is another (closed source) raw editor with this issue, but I don't >> > remember which one it was. >> > >> > Also, I'll try to set the blackpoint myself. I didn't realize there is >> a gui >> > option for that. I'll report back. Hopefully it's indeed consistent >> across >> > images, although I could not find the correct blackpoint in the gui of >> > RawTherapee before they patched DCRaw. >> > >> > Regards, >> > >> > Martijn >> > >> > Op zo 15 mei 2016 om 14:51 schreef johannes hanika <hana...@gmail.com>: >> >> >> >> hey, >> >> >> >> i believe our black point is correct (see screenshot below [0]). >> >> >> >> it's just a bit much to ask to push a 3200 ISO image by 3 stops and >> >> get useful colour rendition out of the box. the rawtherapee shot looks >> >> like a different whitebalance/colour profile/curve has been applied? >> >> >> >> anyways, you're always free to change the black point for such noisy >> >> shots in emergency cases. maybe if that is consistently the case for >> >> all images, we should include a high-iso black level into the rawspeed >> >> cameras.xml? >> >> >> >> cheers, >> >> jo >> >> >> >> [0] >> >> >> http://picpaste.com/pics/2016-05-16-004547_2560x1440_scrot-6zN1i4ho.1463316422.png >> >> >> >> On Mon, May 16, 2016 at 12:13 AM, Martijn Kruiten <mart...@kruiten.nl> >> >> wrote: >> >> > Hi, >> >> > >> >> > There seems to be an issue with the blackpoint for some Fujifilm >> >> > cameras, or >> >> > at least the X100 model. I'm not sure if you're using DCRaw as the >> >> > decoder, >> >> > but it had and may still have an issue that causes this, which has >> been >> >> > patched by RawTherapee after I reported it back in 2013 >> >> > (https://code.google.com/archive/p/rawtherapee/issues/2049). What >> >> > happens is >> >> > that the darkest parts of the image have a green tinge because the >> >> > blackpoint is read incorrectly from the raw file. This is >> unfortunate, >> >> > because I really like working with Darktable. I exported a sample >> with >> >> > the >> >> > exposure >> >> > correction set at +3 and exported the same image with default >> settings >> >> > from >> >> > RawTherapee to show what I'm talking about: >> >> > >> >> > >> https://www.dropbox.com/sh/m5wtb7rfyxv1e1r/AABQ6czz7p-l9qf0Sly8093wa?dl=0 >> . >> >> > The raw is also included. If I can help in any way, please let me >> know. >> >> > >> >> > Regards, >> >> > >> >> > Martijn Kruiten >> >> > >> >> > >> >> > >> ___________________________________________________________________________ >> >> > darktable developer mailing list to unsubscribe send a mail to >> >> > darktable-dev+unsubscr...@lists.darktable.org >> > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
