Actually, going back to it, I stated things backwards: it was the LCh chroma channel that was seeing the vivid blues as less saturated than the skintones, not the HSL one. Sorry.
On 2013-12-27 [email protected] wrote: > I miss darktable's parametric masking when using Gimp now, so I've been > attempting to use darktable in more "interesting" ways that I would have used > layers for previously. While doing so, I found the following things odd: > > While trying to mask the most saturated areas of an image, the "virtual S of > HSL" chroma channel was seeing fairly pale skintones as more saturated than, > say, a very saturated-looking piece of blue-cyan clothing, for example, > giving very unexpected results, and different from those of the LCh chroma > channel on the modules which use that. I understand that they are not the > same thing, but should they be that different? I created a full-saturation > spectrum gradient in gimp, such that moving across it with the color sampler > showed a consistent saturation of 100%, and doing the same in darktable with > the HSL S channel showed much higher values centering on RGB than on CMY > bands, but this may not be a very good test. I don't have a color card to > photograph. Can anyone confirm that this is expected behavior? If so, I'll > shut up and adapt to it. :) > > Another unexpected (by me) thing is that when using the "difference" blending > mode in Lab space modules, the image is completely desaturated, even with > opacity set at 0%. This doesn't happen with RGB modules. Again, this may be a > known and expected behavior, in which case sorry for the noise. I just found > it slightly confusing at first, not knowing much about the inner workings of > the various color models. ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
