channel mixer rgb was a working name given to the color calibration module 
during development, before finallyit was finally decided to rename it to color 
calibration. So, looks like a mistake in the release note. Not sure if there 
was another module where they implemented these collapsing panels, I haven’t 
been following DT that closely of recent months…

-----------------
MATTHEW MAGUIRE

M.Teach Candidate



Sydney School of Education and Social Work

Faculty of Arts and Social Sciences

The University of Sydney



Tel: +61 457 750 214

Email: [email protected]

________________________________
From: Bruce Williams <[email protected]>
Sent: Sunday, July 10, 2022 8:54:36 PM
To: darktable <[email protected]>
Subject: Fwd: [darktable-dev] Re: [darktable-user] darktable 4.0.0 released

Hi all,
Just perusing the release notes for 4.0.0, and under the sub-heading "UI 
rewrite", I se the following:


New collapsible sections have been added to avoid
cluttering the UI in the following modules:

  *   channel mixer rgb
  *   exposure
  *   color calibration

Now, I've searched the module preset manager, and I cannot see (nor have I ever 
heard of) a "channel mixer RGB" module.
Is this a typo which was meant to refer to the Colour Calibration Module (I'm 
guessing not, as CC is mentioned third in the list), or something else?

Cheers,
Bruce Williams
------------------------------
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---------- Forwarded message ---------
From: Matt Maguire <[email protected]<mailto:[email protected]>>
Date: Mon, Jul 4, 2022 at 2:21 PM
Subject: [darktable-dev] Re: [darktable-user] darktable 4.0.0 released
To: Terry Pinfold <[email protected]<mailto:[email protected]>>
Cc: darktable-user 
<[email protected]<mailto:[email protected]>>,
 darktable-dev 
<[email protected]<mailto:[email protected]>>




On Mon, 4 Jul 2022 at 11:09, Terry Pinfold 
<[email protected]<mailto:[email protected]>> wrote:
I have looked for this UCS 22 colour space in the input color profile module 
and I tried to find information in the latest user guide, but I don't see it 
anywhere. Is this just something that is hidden from the user or is it 
something I should be selecting somewhere.

It is used internally within the colour balance RGB module, not as a pipeline 
working colour space. If you go to the masks tab in color balance rgb, you'll 
find an option "saturation formula" which selects whether to use the new UCS 
colour space or the previous Jzazbz colour space. It is documented in the user 
guide:
https://darktable-org.github.io/dtdocs/en/module-reference/processing-modules/color-balance-rgb/#saturation-formula

Regards,
Matt.

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