On 17/02/2015 19:24, Marc Cousin wrote: > On 17/02/2015 18:39, Francisco Cribari wrote: >> Dear Marc: >> >> [1] May I ask you which base curve you used? I noticed you did not use >> the Fuji X100S base curve that comes with Darktable. > That's because your image is DR-200. I usually change the basecurve a > bit and raise the exposition +1 to compensate, automatically (I have a > lua script to do that). This basecurve boosts a bit the low lights. I'm > not sure it is better, it's just the way I like it, and I tried to make > it look close to what the camera produces with DR-200. > > Maybe I should calibrate the camera in DR-200 to get a correct > basecurve, one of these days, instead of relying on my handmade > basecurve :) > >> >> [2] I noticed you used an agressive denoise profiled setting (wavelet + >> color): strength = 3.819. > Yes, I still had a bit of moiré without such an agressive setting on > your image. But maybe I went a bit too far, I don't know. I did it very > quickly (I think my result was a bit overexposed, I just removed the > moiré and got rid of the green artefacts I got by applying defringe). > The purpose was just to show you that the way to go was probably the > color/wavelet denoising (the only one I'm applying, most of the time). > >> >> [3] This may be off-topic, but what are the advantages of an X-Trans >> sensor for those who shot RAW? All my other gear have Bayer sensors >> (Nikon D800, Nikon D7100, Nikon D7000, Canon G1X etc.) and I have never >> had that much problem with moiré (the Nikon D7100 camera does not have >> an AA filter). I have a couple of friends who have Nikon D800E cameras >> (no AA filter) and they have not encountered problems with moiré either. >> On the other hand, I have been delaing with moiré in several X-Trans RAW >> images in DT. The default demosaic method is now different for X-Trans >> images in DT which signals that moiré is a concern when it comes to such >> images. Are there clear X-Trans advantages to X-Trans sensors that make >> they worth? Are the X-Trans demosaic algorithms mature by now or can we >> expect improvements in the next few years? > > On this point, I cannot really comment. I chose my camera (XE2) mostly > because of the way it works (dials) and because of the XF lenses (good > quality, aperture ring), and I got very good results straight from the > camera when I tested it. > > That is my first and oly digital camera. I used to do film before, so I > cannot even compare with Bayer sensors. > > Are you or your friends also using darktable with their cameras ? Or are > they using Lightroom or another tool that may already do the denoising > by default ? Or maybe, if they use darktable, they already do denoising > by default ? I guess darktable needs a bit more tweaking than most > proprietary software (in fact, I don't know, I never used any other tool > except rawtherapee).
I'm still wondering about a problem I've seen very clearly with this RAW: when denoising with wavelets, there are green artefacts on many edges. Here is the original image. Only demosaic (markesteijn 3 pass, with five times color smoothing), basecurve https://drive.google.com/file/d/0B_liIOwDeWUmWnVSMVdpcFp2bU0/view?usp=sharing There is moiré, and small artefacts on the camera's edges, but it's not that bad. Add a profiled denoising, wavelet, on color. Be a bit more agressive than the default values. https://drive.google.com/file/d/0B_liIOwDeWUmeTZLUnk1eDBubHc/view?usp=sharing Moiré is gone from the shirt. But you get green on lots of places… on the camera for example. Adding a very aggressive defringe is a way to get rid of this green, but destroys a lot of colour... https://drive.google.com/file/d/0B_liIOwDeWUmXzRBZG53bHdYaFE/view?usp=sharing But I feel that the defringe shouldn't be needed here (or at least not for that), and there is something I don't get about the denoising… Could someone shed some light on this ? :) The original RAW file was here: https://dl.dropboxusercontent.com/u/2171814/_FFX7922.RAF Regards Marc ------------------------------------------------------------------------------ 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=190641631&iu=/4140/ostg.clktrk _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
