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00:00:00
dark table 3.4 has a new module called00:00:03
color calibration and there's quite a00:00:05
lot to cover00:00:06
so again i'm going to break it up into00:00:09
two episodes00:00:10
this will be part one let's go00:00:16
[Music]00:00:22
hi and welcome to episode 82 of00:00:24
understanding dark table00:00:27
to my mind the color calibration module00:00:31
has two personalities on one hand00:00:35
it replaces the now deprecated00:00:39
channel mixer module so that's one00:00:42
personality and00:00:45
its other personality is as a supplement00:00:48
to the legacy white balance module00:00:52
in this episode we're just going to look00:00:54
at the first of those two personalities00:00:56
using the new color calibration module00:00:59
as00:01:00
a channel mixer now before we start00:01:03
i do just quickly want to revisit for00:01:06
the benefit of those people who've come00:01:08
straight to this video without watching00:01:10
the dark table 3.4 new features videos00:01:14
in the preferences00:01:17
and under processing we now have a new00:01:21
entry auto apply chromatic adaptation00:01:24
defaults now this pertains00:01:28
to the color calibration module00:01:32
specifically the default option here00:01:35
is legacy so when you first install00:01:39
dark table this will be set to legacy00:01:42
and what that means00:01:43
is that when you either import a new00:01:47
image00:01:48
or reset the history stack00:01:51
on an image you've already got in your00:01:53
library00:01:57
the what legacy white balance module00:02:00
will be00:02:01
applied as per usual00:02:04
and it will default to whatever was00:02:08
the white balance set in camera at the00:02:11
time of exposure00:02:13
the color calibration module will not00:02:16
be added to your list of active modules00:02:20
that's the legacy mode if you change00:02:24
this to modern what you are saying to00:02:27
dark table00:02:28
is whenever i import a new image or00:02:30
whenever i00:02:31
reset the history on an image i've00:02:33
already got in my library00:02:35
i want you to set00:02:38
the legacy white balance module to00:02:42
a new option which we'll look at in just00:02:44
a sec called camera00:02:45
reference and i want you to00:02:49
activate the color calibration module00:02:54
and we'll go into that a little bit more00:02:57
in episode 83 but i did just want to00:03:00
cover it for anyone who00:03:01
didn't watch the new features videos00:03:03
okay so00:03:05
as you can tell i have it set to modern00:03:07
so i'm using the color calibration00:03:09
module by default for all of my00:03:11
processing from this point forward00:03:14
so to use the color calibration module00:03:17
as a channel mixer i have chosen this image00:03:20
of desiree that i shot a few years ago00:03:22
and what i've done is simply hit the00:03:25
reset parameters button in the history00:03:27
stack00:03:28
and as you can see all of the regular00:03:31
things get applied00:03:32
color calibration is turned on and00:03:35
because i've got00:03:36
a scene referred workflow set in00:03:38
preferences as well00:03:39
it also means filmic and exposure uh00:03:42
set to active as well so that00:03:46
is the image straight out of camera00:03:49
now if we look at the active modules00:03:52
we will see that the white balance00:03:55
module has had a little bit of a ui00:03:57
refresh with dark table 3.400:04:00
we now have these four icons one for the00:04:03
white balance as shot in camera00:04:06
one for set the white balance detected00:04:09
from an area and if we click on that we00:04:11
will get the00:04:12
white rectangle that takes up 99 of the00:04:15
frame00:04:17
and so dark table will do its best to00:04:19
read the white balance00:04:20
from the image itself we then have00:04:23
a user modified section where you can00:04:26
set your00:04:27
own color temperature if you have a00:04:30
specific reason for wanting to do that00:04:33
and then we have this new one camera00:04:35
reference00:04:36
point in most cases it should be d6500:04:41
now i will confess that d65 is a00:04:44
whole new language to me i went and did00:04:47
a bunch of reading00:04:48
and i kind of understood some of it and00:04:53
sort of eyes glazed over for a lot of it00:04:56
however i did find an interesting00:04:58
discussion on photo.net and i will put a00:05:00
link to that00:05:02
in the description down below so if you00:05:03
really want to get into the weeds on00:05:05
illuminance00:05:07
then by all means hit that link and go00:05:09
and read up00:05:11
some interesting stuff in there and i00:05:13
probably need to go and revisit it00:05:15
but just understand that if you choose00:05:18
modern00:05:19
as the preference for chromatic00:05:21
adaptation transform00:05:23
in preferences then this00:05:26
legacy white balance module will be set00:05:28
to00:05:29
camera reference or d65 and then00:05:32
the color calibration module will do its00:05:34
thing00:05:35
now on this first tab the00:05:38
chromatic adaptation transform if we00:05:41
want to use00:05:43
the color calibration module as a00:05:46
channel mixer00:05:47
we basically want to set the adaptation00:05:50
to none and that is basically then00:05:54
just turning off this tab00:05:57
essentially it's removing all of the00:06:00
options that are there with the00:06:01
exception of the gamut compression00:06:04
and so now what we've got is an r00:06:05
channel a g channel and a b00:06:07
channel and they are your old now00:06:10
deprecated00:06:11
channel mixer now i don't fully00:06:15
understand the reasons for why the old00:06:17
channel mixer was deprecated i think it00:06:19
was something to00:06:20
do with the the science and the color00:06:23
space in which it worked i think00:06:25
it assumed that you were working in an00:06:29
srgb00:06:30
color space all of the time and00:06:32
obviously00:06:33
these days that's not necessarily the00:06:35
case00:06:37
and the color calibration module will00:06:40
work00:06:41
in an unbounded color space uh00:06:44
throughout its little part of the pixel00:06:47
pipe00:06:48
and that basically means you've got00:06:52
more tones and colors and hues and00:06:54
things to work with00:06:56
that's my understanding don't shoot me00:06:58
if i'm wrong00:06:59
okay so how does this work well00:07:01
basically each of these tabs00:07:03
so r for red g for green b for blue00:07:07
represents the output of that particular00:07:10
color channel00:07:11
and by default the input values00:07:15
to each of those outputs is red is at00:07:18
one and green and blue are at zero00:07:20
on the green channel the green input is00:07:23
at one00:07:24
red and blue are at zero and on the blue00:07:26
channel the blue channel00:07:28
is inputting at one and red and green00:07:30
are inputting at zero00:07:32
so the idea is that you can now create00:07:36
any mix00:07:39
for the output of the red channel simply00:07:42
by00:07:43
choosing to re-adjust the sliders now00:07:47
i am not going to pretend to know how to00:07:50
use this in an efficient manner because00:07:54
i never used the channel mixer either i00:07:57
understand00:07:58
the concept but i just i recognize that00:08:02
it's way too powerful at all for my00:08:04
limited understanding00:08:05
and i would probably do more damage than00:08:08
good if i was to muck around with it if you00:08:11
want to reset these you can just double00:08:13
click on the sliders00:08:14
that's nothing new and that will set00:08:17
everything back to default values you'll00:08:20
then notice there is a colorful tab00:08:22
a brightness tab and a grey tab00:08:26
now the colorfulness tab00:08:29
is there to allow you to either00:08:33
accentuate or attenuate00:08:36
the intensity of anything you did00:08:40
on the rg and b tabs so for example if i00:08:44
was to come and do00:08:46
something absolutely horrendous here i00:08:49
have no idea what i'm doing but let's00:08:50
just say i had done this00:08:52
as a new mix for my red channel00:08:56
i could go to the colorfulness tab and00:08:59
this00:09:00
input red slider will allow me to turn00:09:03
down the effect of that red channel or00:09:06
crank up the effect of that red channel and then00:09:09
the same applies for00:09:11
whatever you do on the green channel you00:09:13
would you would then have the ability to00:09:14
attenuate00:09:16
or accentuate that green00:09:19
channel output on this green slider here00:09:22
and then the same for the blue channel00:09:25
you'll notice at the bottom here a00:09:26
checkbox for normalized channels if you00:09:30
activate that then regardless of00:09:33
what you might dial in across these00:09:36
three sliders00:09:38
all of those values will be summed00:09:40
together00:09:41
and then divided back to a00:09:45
value of one so essentially00:09:48
even though you might have numbers that00:09:50
don't necessarily add up to 1.000:09:54
whatever values you have you know00:09:57
applied across these three sliders00:09:59
will be correlated against each other so00:10:02
that the output saturation00:10:05
is consistent with the input saturation00:10:07
it's just that the channel00:10:08
mix will be a little bit different00:10:12
next up we've got the brightness tab i00:10:14
am just going to reset00:10:15
these and the brightness tab as the name00:10:19
suggests00:10:20
simply allows us to alter the intensity00:10:25
or the luminosity of each of our00:10:28
red green and blue channels so we can00:10:30
make our red channel darker00:10:32
or brighter we can make our green00:10:35
channel darker00:10:37
whoa that's funky uh or brighter00:10:40
or our blue channel darker oh00:10:44
it's like morticia uh or brighter and00:10:47
again the normalized channels checkbox00:10:49
is there00:10:50
to basically average out whatever00:10:55
values you may have entered across these00:10:57
three sliders00:10:59
to then basically end up with a value of00:11:03
one across those three values so that00:11:06
the00:11:07
output luminosity hasn't changed from00:11:09
the input luminosity00:11:12
but the luminosity of the individual00:11:14
channels has been skewed00:11:17
from where it was at the input stage00:11:19
hopefully that makes sense00:11:22
and then finally we've got the gray tab00:11:25
and this is where you will do your00:11:29
monochrome mixes of color images00:11:33
now the moment you move any of these00:11:35
sliders00:11:36
away from their default positions at the00:11:38
far left00:11:40
your image will basically go black and00:11:42
it is then a case of00:11:44
deciding how much of each of the00:11:48
three primary channels you want to00:11:50
introduce into your monochrome mix00:11:53
now sure you can just drag the sliders00:11:56
around and find what looks good for you00:11:58
or you can check out the new presets00:12:01
that aurelian has created here00:12:03
he did mention in his video that he was00:12:06
not entirely happy with the black and white00:12:10
presets that existed00:12:11
in the old channel mixer module and he00:12:14
did confess that he made those up00:12:18
many years ago when he knew less than he00:12:21
knows now00:12:22
and he doesn't feel today00:12:26
in early 2021 that00:12:30
those presets were as accurate00:12:33
as they should have been and he believes00:12:37
that these new00:12:38
presets that he's come up with for the00:12:40
color calibration module00:12:42
are far more representative of00:12:45
the film stocks that they are named00:12:47
after so00:12:49
if you did use the old channel mixer00:12:52
module00:12:53
for some of your past processing00:12:56
exploits it might be worth going back00:13:01
and particularly if you were working off00:13:04
raw files00:13:06
create duplicates disable the channel00:13:09
mixer00:13:10
enable the color calibration module and00:13:14
maybe try some of these presets and just00:13:16
see whether or not00:13:17
you feel that these presets are a better00:13:20
representation of the black and white00:13:22
film stock they're trying to emulate00:13:25
than the presets which were in the old00:13:27
channel mixer module00:13:29
now we'll just mention because the old00:13:31
channel mixer module has been deprecated00:13:34
it means that you won't00:13:38
naturally find that module00:13:41
available in the ui of dark table00:13:44
anymore00:13:45
however if you did watch the videos on00:13:48
new features you would have seen me00:13:49
cover the new00:13:51
modules presets window00:13:54
and within there there is a preset00:13:57
of grouped modules for deprecated00:14:01
modules00:14:02
so even if you do want to keep using the00:14:06
channel mixer module00:14:07
you can access it from there if you want00:14:09
to00:14:10
but i think the recommendation is if you00:14:13
want to do channel mixing00:14:15
trickery today avoid the old channel00:14:18
mixer module00:14:19
and go with the new color calibration00:14:22
module00:14:23
alrighty i am going to leave it there00:14:24
for this episode and in episode 8300:14:27
we will look at using the color00:14:30
calibration module00:14:31
as a supplement to the legacy white00:14:35
balance module00:14:36
looking forward to it all right catch00:14:38
you in the next one00:14:44
[Music]00:14:52
youDescription:
In this episode, we look at using the new (to dt 3.4) Color Calibration module as a replacement for the now-deprecated Channel Mixer module. The discussion about illuminants that I mentioned: https://www.photo.net/discuss/threads/what-is-the-difference-between-5000k-6500k-and-d50-d65.163457/ The Wikipedia article on illuminants: https://en.wikipedia.org/wiki/Standard_illuminant The documentation for the color calibration module https://darktable-org.github.io/dtdocs/module-reference/processing-modules/color-calibration/ The thread that Aurélien started on the color calibration module: https://discuss.pixls.us/t/introducing-color-calibration-module-formerly-known-as-channel-mixer-rgb/21227 As always, thanks to my tier 1 Patreon supporters: Peter Barker Leona Devon Michael Braem Jon Hoskins Alun Spencer Stephen Diehl Rohn Shearer Harald Gaidt Martin Vines Matthias Liebich Peter Schlaufer Kevin McKibben Harald Ulver Pavel Ivanov Michael Rasmussen Scott Whittaker Andy McGarty If you'd like to support my work, get access to these videos before everyone else, AND get access to additional content, please head over to patreon.com/understandingdarktable and pick a tier that is comfortable for you.
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