Hi, Terry, all - just to announce I have used the ToneEQ on a couple
of images now and I start to like it :-) Once you know how it
basically works it is fun to use (albeit lots of surprises may lurk in
the dark).
(Apolgies to István for totally misspelling köszönöm ... never had to
write Hungarian, just knew it orally :-)
What would not be possible IMHO (easily) is an automatic spreading of
the EQMask's histogram over the whole range of EV=(-8...0), simply
because the mask values do depend in a very complex fashion on the
whole bunch of parameters you can chose from. There are many different
settings formally stretching the mask values over the whole range with
(very to totally) different effects, and you can't know beforehand
which set to chose. Hope I got that right (Aurelien? :-).
Hence, the display of the histogram while setting the masking
parameters is helpful, but observing the mask itself is (more, IMHO)
important. The spreading of the mask values allows to better
differentiate, but it is also important which parts of the image are
mapped to which mask values (which in detail again depends on the
masking).
Uwe
Quoting Terry Pinfold <[email protected]>:
Aurelien is a really talented developer that has brought some great
features to Darktable including Filmic, Tone Equalizer and I believe Color
Calibration. I have been impressed with how he has continued to improve
both Filmic and Tone Equalizer to make both of these modules more user
friendly and easier to understand for non-color scientists. A couple of
'improvements (?)' I would like to see going forward with tone equalizer is
to have the mask's histogram on display as I adjust the sliders in the
masking tab. At the moment I jump back and forth between the advanced tab
and the masking tab to spread the histogram as wide as practical. The other
option would be to have the mask's histogram automatically spread across
from left to right based upon the brightness zones.
I am a mere user and do not understand the implications of my suggestions
for a developer and programmer. It may be too difficult, impossible,
undesirable or detrimental to change tone equalizer as I have suggested. In
the meantime I am just so grateful to Aurelien for developing these great
modules.
I have watched Aurelien's videos and I hope I do not misquote him here, but
Aurelien seems to feel Tone Equalizer makes the shadow highlights module
redundant. On this point I would disagree as the visual result from both of
these modules is similar but different. I am even known to use a
combination of both to exploit the synergy.
On Thu, 18 Feb 2021 at 19:35, <[email protected]> wrote:
Hi, everybody,
I had some difficulty to understand what the term "mask" means with
the ToneEQ module. Only after watching Aurelien's tutorial
(https://www.youtube.com/watch?v=kzACn3l49HM), in particular the part
starting at 20:13, I grasped the idea (which is actually not hard to
understand) but which does for me not match what a mask is.
For me, a mask is always something masking an effect. For simple pixel
ops like tone effects, for each pixel the output O is O=M*F(I)+(1-M)*I
(where '*' denotes an operation which ensures M*I+(1-M)*I=I). I is
the input value, F the function (e.g. a tone curve) and M is a mask
value.
However, the so-called mask in ToneEQ is part of the function F :
O=Msk*F(Map,I)+(1-Msk)*I where Msk is a usual mask and Map is what's
currently called mask in ToneEQ. Hence, for me, and I think others as
well, the usage of the term mask in the ToneEQ module is confusing. It
is rather a parameter map than a mask as it determines what's
happening to a value but not to which extent (which leads to the
effect that, in addition to the ToneEQ mask, one can apply real masks
to restrict the effect to parts of the image). Now, the term has been
introduced in the manual, but still I'd find it disturbing. Maybe one
could change this over time so to keep the meaning of mask clear, and
call it a parameter map?
Uwe
still a DT beginner but slowly getting to it.
____________________________________________________________________________
darktable user mailing list
to unsubscribe send a mail to
[email protected]
--
____________________________________________________________________________
darktable user mailing list
to unsubscribe send a mail to [email protected]
