Zbigniew, Can you prepare a CR2 similar to this one? http://i.imgur.com/0sixStb.jpg
It can be the original CR2 from the same example, if you can find it or get it from OP. Or a similar scene that shows the same defect. I've got a theory about a possible fix, so I'd like to look into it. Basically, in some cases the noise has no longer zero mean, so it's affecting the overall colors (rather than just introducing random variations). If you know the noise profile, it might be possible to find adjustment curves that can undo the hue shift ( http://i.imgur.com/VhL5FKC.png ) to get something like this: http://i.imgur.com/gDJtRnz.jpg (which would still have noise, but overall, the shadows should be dark gray, not magenta). > That's luminance noise and certainly not a problem to me. To me, it looks like chroma noise, but the defect is not really obvious in this example. On 10/24/16, Pascal Obry <pas...@obry.net> wrote: > > Zbigniew, > >> Anyway, I'm aware it's rather a matter of personal taste, but I'm >> convinced >> that after you examine both pictures again - and even more closely - >> you'll >> agree that this Silkypix-made is a little bit better. The one you >> generated >> shows the surface of car body as covered with a little scratches >> (zoom to 1:1 and compare). > > That's luminance noise and certainly not a problem to me. If you print > the picture it will be far better with a bit of luminance noise as it > create "matter" on the surface. It avoids long, flat surface. I usually > never correct luminance noise or if I do I'm doing it very slightly. > >> So you mean presently fixable only by denoising? OK, thanks - I'll >> explore >> Darktable's abilities in this area; I'm rather displeased with the >> way I was >> able to cure the problem using LR 5.7.1 (well, still not being "LR- >> wizard") >> - that's why I was looking for the software which do import, after >> which >> there's no need to deal with that red noise. Maybe they ware right >> that presently only Canon's DPP does it 100% properly. > > I doubt it. But Canon DPP is certainly quite tuned for .CR2 :) But on > the other hand Canon DPP is a toy compare to darktable. > > -- > Pascal Obry / Magny Les Hameaux (78) > > The best way to travel is by means of imagination > > http://www.obry.net > > gpg --keyserver keys.gnupg.net --recv-key F949BD3B > ___________________________________________________________________________ > darktable developer mailing list > to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org > > ___________________________________________________________________________ darktable developer mailing list to unsubscribe send a mail to darktable-dev+unsubscr...@lists.darktable.org
