Hi Francisco,
Ulrich's advice seems right on!
In the newer NEF file I'm still not seeing areas of reds with low enough
luminosity to trigger these artifacts. It may just be that the X-Trans
image by a particularly fortuitous chance recorded such saturated dark
reds, but that's a hard to replicate
There have already been some very valid remarks on this topic. It's
obvious that your specific use of the tone curve can give some issues at
the "darker" end.
Eventually this is strongly linked to the occurence of "unbounded"
colors. You can read here
http://www.darktable.org/usermanual/ch03s0
Hi Dan:
Here is another test shot (.NEF, Nikon D800):
RAW (.NEF): https://dl.dropboxusercontent.com/u/2171814/_F1C6327.NEF
XMP: https://dl.dropboxusercontent.com/u/2171814/_F1C6327.NEF.xmp
Best, Francisco
On Mon, Jan 5, 2015 at 12:34 PM, Dan Torop wrote:
> Hi Francisco
>
> I think the darks
Hi Francisco
I think the darks have to be very dark in the image to see artifacts --
if they even happen. When you choose the eyedropper from tone curve and
click in the image, the L levels in the darkest (and artifact-ed) bits
of the X-Trans image have L values of 1 or 2 (and are changed to abou
Hi Dan:
Here is a photo I've just made (for testing purposes) of my wife wearing a
red shirt (.NEF, Nikon D800).
RAW (.NEF) file: https://dl.dropboxusercontent.com/u/2171814/_F1C6322.NEF
XMP file: https://dl.dropboxusercontent.com/u/2171814/_F1C6322.NEF.xmp
Best, Francisco
On Mon, Jan 5, 2015
Hi Francisco,
Do you have an example NEF file? One with shadows with saturated colors
would make this most visible. The Nikon sensor could also be less noisy
in the shadows.
I'm not sure if these artifacts are just a cost of automatic chroma
scaling, or should be considered a bug for a corner ca
Hi Dan:
Thank you for your message. I have been noticing color artifacts when
raising the lower point of the tone curve when editing X-Trans RAW images
but not when editing standard Bayer RAW images (e.g., Nikon D800 .NEF). Is
there anything specific to X-Trans RAW images here?
Thanks again. Best
Hi Francisco,
This is interesting... The trouble seems to come via the tone curve
module's automatic scale chroma setting. (The noise doesn't seem to
depend upon the demosaicing algorithm -- it's there with VNG or
Markesteijn.)
When "scale chroma" is set, each pixel processed has its saturation
Francisco,
Probably this I more a message for the devel list than for this one. I am
already copying that list. You would like to fill this as a redmine bug for
better tracking.
Regards
El 5/1/2015 0:24, "Francisco Cribari" escribió:
> My second camera is a Fuji X100S, which has an X-Trans sens
My second camera is a Fuji X100S, which has an X-Trans sensor. I am getting
color artifacts in several images when I raise the lower end of the tone
curve. The problem does NOT happen with my Nikon D800 RAW images, only with
X-Trans RAW images. I would also like to point out that it is common to
ra
I created that basecurve for my camera (Fujifilm X100S) using 14 RAW and
JPG images. The script I generated can be obtained from
https://dl.dropboxusercontent.com/u/2171814/fujifilm-x100s.sh
The collected data is at
https://dl.dropboxusercontent.com/u/2171814/fujifilm-x100s.dat
I got in touch w
Am 30.12.2014 um 23:57 schrieb David Vincent-Jones:
> Hi Francisco;
>
> I had a look at your image and note a couple of things that would not be "my
> way" of processing this piece.
>
> The 'base curve' that you are using is quite different from the X100S
> standard
> curve and that really ch
Hi Francisco;
I had a look at your image and note a couple of things that would not be "my
way" of processing this piece.
The 'base curve' that you are using is quite different from the X100S standard
curve and that really changes the lighting dynamics of the scene.
Secondly the 'tone curve' i
My second camera is a Fujifilm X100S, which has an X-Trans sensor. I
recently reported here that I've been noticing moiré in some images. I am
also having other problems. I get color artifacts when I move the lower end
of the tone curve up. An example (a photo I made today of my wife):
RAW (.RAF)
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