I tested this some time ago, trying to apply my custom printer profile directly from darktable's output module. Usually I apply my printer profile with tificc after exporting the image.
And I can say that, when "always use lcms2" option is enabled, the intents work, but there is one feature missing, very important for me: black point compensation. When applying my custom printer profile with tificc most times I get the better results using relative colorimetric intent. Perceptual gives me some times more natural skin tones in portraits. But for landscape pictures, relative colorimetric gives me better contrast and deeper shadows. But I need to use always the option -b in tificc to enable black point compensation. Without it, I get awful awful gray tones in parts of the image that should be deep black. And that's the problem I have when I try to apply my printer profile directly from darktable's output module. The black point compensation is not enabled. I see there is a comment about this in iop/colorout.c /* TODO: the use of bpc should be userconfigurable either from module or preference pane */ /* softproof flag and black point compensation */ transformFlags |= cmsFLAGS_SOFTPROOFING | cmsFLAGS_NOCACHE | cmsFLAGS_BLACKPOINTCOMPENSATION; So I think this option should be implemented at least in the future printing module. Josep V. Moragues El 15/12/14 a les 16:53, johannes hanika ha escrit: > are you using the lcms2 codepath or our fasttrack-internal one (there is > an option for that in the preferences window). the lcms2 codepath should > respect the intent. > > -jo > > On Tue, Dec 16, 2014 at 1:58 AM, Pascal Obry <pas...@obry.net > <mailto:pas...@obry.net>> wrote: > > This is probably for our expert on profile and color management :) > > It seems to me that the intent in the export module is not used at > all. I'm suspecting this while working on the print module. > > I made an experiment. I've exported a picture in ppm and check the md5 > signature of the exported image. The very same signature is reported > for whatever intent selected. > > Is that expected? Am I missing something? > > Thanks, > > -- > Pascal Obry / Magny Les Hameaux (78) > > The best way to travel is by means of imagination > > http://v2p.fr.eu.org > http://www.obry.net > > gpg --keyserver keys.gnupg.net <http://keys.gnupg.net> --recv-key > F949BD3B > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & > more > Get technology previously reserved for billion-dollar corporations, FREE > > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > _______________________________________________ > darktable-devel mailing list > darktable-devel@lists.sourceforge.net > <mailto:darktable-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/darktable-devel > > > > ------------------------------------------------------------------------------ > Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server > from Actuate! Instantly Supercharge Your Business Reports and Dashboards > with Interactivity, Sharing, Native Excel Exports, App Integration & more > Get technology previously reserved for billion-dollar corporations, FREE > http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk > > > > _______________________________________________ > darktable-devel mailing list > darktable-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/darktable-devel > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=164703151&iu=/4140/ostg.clktrk _______________________________________________ darktable-devel mailing list darktable-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/darktable-devel
