Hallöchen! Gert van der Plas - Schrama writes:
> [...] > > If so what is the use for the base curve in RGB? Is it an > alternative way for exposure and blacklevel? I assume the Bayer > patterned RGB response curves of the sensors are already properly > corrected in the RGB color matrix conversion process. Mathematically, there is a significant difference whether you apply a gamma curve to RGB channels or Lab channels, no matter whether you do the latter with auto chromaticity or not. At the same time, there is no objective argument why the base curve should yield a more pleasing result than the tone curve. However, the base curve works similar as the chemicals in photographic film. They, too, have a non-linear gamma-like response curve. And they, too, yield gray if all three channels are the same. This way, the base curve tries to meet our photographic viewing habits. Tschö, Torsten. -- Torsten Bronger Jabber ID: [email protected] or http://bronger-jmp.appspot.com ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
