On 2012-12-30 22:37, Markus Jung wrote: > You assume the RAW image is neutral. This assumption is wrong.
But isn't the entire point of an input profile to fix this? > Camera sensors are far away from being linear, especially at the very > bright tones. The base curve corrects this distorted response curve and > makes the images look similar to the OOC JPEG results. Shouldn't this be a simple gamma curve? No fancy camera specific handling? > If you do not > like the style of your camera vendor you can modify the base curve to > fit your own needs. I expect a more neutral (less contrasty) base curve > to look similar like the original one. > > The new alternate base curves provided by Pascal (many thanks!) have > shown in an impressive way how important a good base curve is. I > reworked a lot of images and the new base curve improved most of them by > a large amount. The color rendering (especially for skin tones) improved > a lot, too. > > And another observation: Base curve and tone curve behave different. I > tried some adjustments with tone curve and failed, the same tweaks > worked well with base curve. > > Regards, > Markus > > Am 30.12.2012 22:11, schrieb Marie-Noëlle Augendre: >> First thing I do when I begin to work on a picture is deactivate the base >> curve. I'd rather start from something as neutral as possible, than to make >> modifications/corrections over something that is made automatically and >> whose effect I don't like. >> Then I use the tone curve to make the modifications I want, and that are >> different for each picture. >> >> Marie-Noëlle >> >> 2012/12/30 Markus Jung <[email protected]> >> >>> You must not disable basecurve, the images looks like if you did this. >>> >>> Sensors differ in the way how they respond to brightness, the basecurve >>> expresses how the sensor values have to be interpreted. >>> >>> Regards, >>> Markus >>> >>> Am 30.12.2012 22:08, schrieb Eckhart Pedersen: >>>> Hi all, >>>> >>>> I have tried very hard to understand color management for years, and I >>>> think I have finally understood the basics. I have now calibrated my >>>> Dell U2410 with an i1 display pro colorimeter + DispcalGUI, installied >>>> the profile system wide, and am now using this profile in darktable. I >>>> have even verified the calibration and profile using the colorimeter and >>>> everything seems to be ok. >>>> >>>> Calibration was done in standard mode of the display, 30 Brightness, 50 >>>> contrast, and 6500K black body as whitepoint target. >>>> >>>> If I now load a raw image from my Canon EOS 5D II in darktable and >>>> disable all processing (except sharpening), I would expect to get a >>>> usable/neutral rendition of the photo on my display. However, the photos >>>> look very dull/muted. Since darktable comes with an existing input >>>> profile for the 5D II (it does, doesn't it?) I would expect the default >>>> look to look more or less natural, without having to fiddle with curves, >>>> saturation, or contrast in any way. But this does not seem to be true. >>>> It looks completely wrong. >>>> >>>> You can find an example image here. >>>> >>>> *raw* *CR2*: http://cornergraf.net/darktable.org/raw.CR2 >>>> *exported JPG* with everything off, except sharpening: >>>> http://cornergraf.net/darktable.org/muted2.jpg >>>> *exported JPG* with black level +0.10, and exposure +1.3: >>>> http://cornergraf.net/darktable.org/proper2.jpg >>>> >>>> Please help me understand what is going on here. Is this the way the >>>> files should look like straight out of the camera and with no >>>> processing? Is my display calibrated or profiled incorrectly? What do >>>> you get when you look at the exported JPG files, which one looks more >>>> natural? >>>> >>>> I would greatly appreciate any help you can give me. >>>> >>>> Regards, >>>> Eckhart >>>> >>>> >>>> >>>> >>>> >>> ------------------------------------------------------------------------------ >>>> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, >>>> MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current >>>> with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft >>>> MVPs and experts. ON SALE this month only -- learn more at: >>>> http://p.sf.net/sfu/learnmore_123012 >>>> >>>> >>>> >>>> _______________________________________________ >>>> Darktable-users mailing list >>>> [email protected] >>>> https://lists.sourceforge.net/lists/listinfo/darktable-users >>>> >>> >>> >>> ------------------------------------------------------------------------------ >>> Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, >>> MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current >>> with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft >>> MVPs and experts. ON SALE this month only -- learn more at: >>> http://p.sf.net/sfu/learnmore_123012 >>> _______________________________________________ >>> Darktable-users mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/darktable-users >>> >> >> > > ------------------------------------------------------------------------------ > Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, > MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current > with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft > MVPs and experts. ON SALE this month only -- learn more at: > http://p.sf.net/sfu/learnmore_123012 > _______________________________________________ > Darktable-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/darktable-users > ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnmore_123012 _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
