https://github.com/darktable-org/darktable/commit/3647398b
On Wed, 10 Dec 2014 23:37:40 +0100 KOVÁCS István <[email protected]> wrote: > Hi, > > I'm sure this has been discussed before, but I just can't find it. Why > is it that given the same shot, darktable/digiKam (showfoto) and > UFRaw/RawTherapee display different values for temperature and tint? > Process: > 1. open grey card (WhiBal) shot in darktable and ufraw. > 2. read spot white balance in darktable -> card really turns grey > 3. note RGB multiplier values (in my case: 1.139, 1, 2.633) and > temperature/tint (3447K and 1.138) > 4. open image in ufraw, set the same RGB multipliers -> card turns > grey, temperature and tint very different (2570K, green: 0.95) > 5. open image in showfoto, set WB to manual, enter darktable's values > (T: 3447K, Green: 1.14) -> card turns grey > 6. open image in rawtherapee, apply ufraw's values (Temperature: 2570, > Tint: 0.95) -> card turns grey > > If memory serves me well, RT is based of dcraw; ufraw too, while > darktable uses both rawspeed and libraw (dcraw), but I think for my > Nikon D7000 it's rawspeed. Is this related? How is one to interpret > temperature? > For higher temperatures, the difference is smaller, but still present, > e.g. a sunlit shot with camera white balance is shown with temperature > = 5291K in darktable and as 4710K in RT; a shot in partial shade 6124K > in dt and 5928K in RT (reading the same camera multipliers). > > Thanks, > Kofa > > ------------------------------------------------------------------------------ > 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-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/darktable-users ------------------------------------------------------------------------------ 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-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
