hello again. Thanks for your answers, but I still don't thik this behaviour is normal at all. Though the channel mixer works in output colour space (which I had not realized untill now), the preview shold take this into account. I made a mistake in my previous post: Lighttable mode shows the image correctly, with the same shades of grey as those observed when editing it in Darkroom mode. The problem appears after exporting the picture. In order to illustrate the issue, I have prepared some pictures of the defferent steps of the process. As a non-google user, I have searched for a registering free file sharing site that I think will meet my porpuses. I include a link to a zip file with the examples. They are low quality screen captures, but I think they show the problem I'm trying to explain.
http://netkups.com/?d=96b3657d80357 If anyone knows of a better way of sharing files which doesn't require signing in, loggin, registering and is open source, please, let me know ;) Cheers > Asunto: > Re: [Darktable-users] Channel mixer and print module issues > De: > johannes hanika <hana...@gmail.com> > Fecha: > 12/01/16 10:17 > Para: > Darktable-users <darktable-users@lists.sourceforge.net> > > heya, > > the channel mixer works in output colour space, right? so i'd expect > the results to vary randomly between what you see on screen and what > you export for print. i would probably try to produce the same effect > with a Lab space module (color correction, monochrome, color zones, > maybe all of them in combination with parametric masks?). > > -jo > > On Tue, Jan 12, 2016 at 8:48 AM, Marcial Gómez Martín > <mmg...@openmailbox.org> wrote: >> Hi all, >> I have indeed my display profiled, but it is not a question of a subtle >> colour cast. The situation is as follows: >> I apply the B/N preset of the Channel mixer. When I see the preview >> (Darkroom mode) the result is very similar to what I get if I apply the >> monochrome module: there's a blue colour that turns into a light grey. >> After exporting the image, this same blue results into an almost black tone. >> In the channel mixer module, the B/N preset is about 200 red, 700 green >> and 100 blue (roughly) in the grey "output" and the result is, as I >> said, similar to that of the monochrome module. In darkroom mode the >> preview is correct. In the lighttable preview it is already wrong, and >> the exported JPG has the blue almost black. >> To mimic this tones in the channel mixer preview, I have to push the >> blue slider to about -150/200 and increase red and/or green channels. >> I don't know if someone is experiencing something similar. This is the >> Debian testing package from the repos. >> Regards >> >> >> El 11/01/16 a las 09:09, Sebastian escribió: >>> Hi, >>> >>> Do you have a profiled display and the image viewer does not support >>> color management? >>> >>> Sebastian >>> >>> On 01/10/2016 08:52 PM, Marcial Gómez Martín wrote: >>>> Hello everyone. >>>> I've noticed an issue regarding the channel mixer. >>>> When I choose the B/N preset it is fine in darkroom mode, but, if I >>>> export it. the jpeg appears to have way less blue than expected. >>>> I've just installed the DT 2.0 from the Debian testing repositories. >>>> Apart from that, when I try to open an image in the new printing >>>> module, it doesn't appear at all. >>>> I hope it can help polish this fantastic piece of software! >>>> Regards, >>>> Marcial >>>> >>>> >> >> >> >> ------------------------------------------------------------------------------ >> 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 >> > >
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