Hi Ulrich,
thanks for the fix in the blending modes, it effectively solve my
off-pixels problems.
With regards to the equalizer artefacts, I will then have to use another
tool to enhance
this sunset. This is a chance that one can achieve quite the same
effects with different
tools in DT.
As for whether or not it is an inherent property of the equalizer module
is certainly a
good question for Johannes who developed this module and the underlying
theory.
Florian
Sujet:
Re: [darktable-devel] ligtness blending & equalizer's global contrast
De :
UlricHi Ulrichh Pegelow <[email protected]>
Date :
18/01/2013 21:39
Pour :
[email protected]
Hi Florian,
sooo, I checked your files and can confirm your findings.
The first issue (off pixels) is obviously a bug. As you already wrote we
are converting values from RGB to HSL and back. If the input is out of
range, this leads to problems. In current git master I fixed the issue
by clamping the input values accordingly (which btw was already done in
our OpenCL path). I might need to inspect further to find out where the
out-of-range pixels are generated. It's quite clear we*need* to clamp
all input pixels in blending if we want to transfer to some other color
space.
The second issue with equalizer might be an inherent property of that
module. Older versions of darktable show the same effect. In fact
similar settings lead to comparable artifacts also on other images that
I have tested. So you probably went over the top with your choice of
module values
Ulrich
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