On Mon, 4 Jul 2022 at 11:09, Terry Pinfold <tpinf...@gmail.com> 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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