If the problem exists before you have made any adjustments to the image
and, given that the problem is resolved by choosing a different input
colour profile, I wonder if this is caused by an inaccurate input colour
profile for that camera.
There are a couple of articles that deal with this. There is the general
article on adding support for a new camera (
http://www.darktable.org/2012/10/whats-involved-with-adding-support-for-new-cameras/)
and an article that deals specifically with colour profiles (
https://encrypted.pcode.nl/blog/2010/06/28/darktable-camera-color-profiling/
).
I did have a go with Pascal's instructions (2nd article above) and it does
seem very sensitive to how the target is lit.
On 1 January 2015 at 22:42, Michele B <mich...@gmail.com> wrote:
> Hi all. I'm writing here because I haven't found a solution to my
> problem. Maybe someone will help me understand something more.
> Importing a raw image shoot with my Olympus E-PL3 in Darktable, the
> image shows oversaturated artifacts, especially on blue and magenta
> colors like in the examples available here:
>
> https://drive.google.com/open?id=0BzMPhxj4q7BJT3VWQTdRb1ZDYTg&authuser=0
>
> The only way I've found to avoid this problem is selecting linear
> Rec2020RGB instead of standard color matrix in "input color profile"
> module, but I don't know why. In this way colors looks more natural,
> even if less saturated than the OOC jpeg.
> The same problem exist using other Olympus raw samples taken from
> http://rawsamples.ch, like these two:
>
> http://rawsamples.ch/raws/olympus/RAW_OLYMPUS_EPL5.ORF
> http://rawsamples.ch/raws/olympus/RAW_OLYMPUS_EM1.ORF
>
> Thank you!
>
> --
> Michele
>
>
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