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.
[2] I noticed you used an agressive denoise profiled setting (wavelet +
color): strength = 3.819.
[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?
Thanks a lot for the tips and suggestions. They were most helpful. Best,
Francisco
Message: 7
Date: Sun, 15 Feb 2015 16:02:31 +0100
From: Marc Cousin <[email protected]>
Subject: Re: [Darktable-users] X-Trans images with moir? (in DT but
not in LR)
To: [email protected]
Message-ID: <[email protected]>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 15/02/2015 14:57, Francisco Cribari wrote:
> I have been noticing moir? in several Fujifilm RAW files (.RAF,
> X-Trans). Here is an example:
>
> RAW file: https://dl.dropboxusercontent.com/u/2171814/_FFX7922.RAF
>
> XMP (RAW): https://dl.dropboxusercontent.com/u/2171814/_FFX7922_01.RAF.xmp
>
> JPG (SOOC): https://dl.dropboxusercontent.com/u/2171814/_FFX7922.JPG
>
> XMP (JPG): https://dl.dropboxusercontent.com/u/2171814/_FFX7922.JPG.xmp
>
> There is moir? in the blue shirt in the RAW file, but not in the SOOC
> JPG. (Take a look, e.g., at the area between his camera and his vest
> after zooming in.) Even with Markesteijn 3-pass demosaic + five times
> color smoothing I still see moir?.
>
> I wanted to find out whether this is a Fujifilm-related issue or a
> Darktable-related issue, so I asked a friend to open the RAW file in
> Lightoom (version 5.7.64) and export a full resolution JPG. (Since all
> my computers rum Linux, I do not access to LR.) Here is the resulting JPG:
>
> JPG exported by Lightroom:
> https://dl.dropboxusercontent.com/u/2171814/_FFX7922b.jpg
>
> I see no moir?.
>
> Is there a way to get rid of moir? in X-Trans images when using
> Darktable? Comments and tips and welcome. Best, Francisco
>
Hi, I've been toying with your import.
What was weird was that I didn't get the moir? at all with my default
settings. After a bit of trial and error, I found that it's my profiled
denoise (wavelet, on color) that removes the moir?. It seems logical
afterwards, but maybe you'll get a better explanation by one of the
experts on the mailing list. Meanwhile, give a try to this setting.
I could improve a bit the result by being more agressive with the
denoising (as the camera must have done, as the resolution on the shirt
isn't that wonderful on the SOOC jpeg), then removing fringing.
Here are the jpeg I managed to get
http://dl.free.fr/rm.pl?h=qplZFfYAV&i=71793947&s=RYsfRXzrsDAPVfCLYHWtaTqwzUvwNVao
and the XMP
http://dl.free.fr/rm.pl?h=v5E43Q0ZK&i=71793977&s=NhKwhz2Am1DoTsJTr3YgOrmXNQCNiHA8
Regards
Marc
--
Francisco Cribari - http://about.me/cribariFrancisco CribaraaahhhFrancisco
Cribari - http://about.me/crihhhrancisco Cribari -
http://about.me/cribariffaaaaFrancisco Cribari - http://www.cribari.com.br
- "All theory, my friend, is grey, but green is life's glad golden tree."
--Goethe (Faust)
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