(01-22-2021, 10:23 AM)rich2005 Wrote: Something to look for when Gimp 2.10.24 is released.
For those photographers out there.   In the latest Gimp 2.10.23 appimage - a new GEGL filter 'Negative Darkroom' (in Tools -> GEGL Operation at the moment)

Does what it says, processes a negative to an image for printing.  Excuse this example, I do not have a negative scanner or a light box so this was photographed in a slideholder against daylight. (basically against a window )   

Those 'Characteristic Curve' presets might be interesting, Several under the colour option for Ilford mono film types.

(10-26-2024, 10:08 AM)rich2005 Wrote: This is in kubuntu 24.04 / Gimp 2.10.38  

(1) Tools menu -> GEGL Operation
(2) In the GEGL Operation dialogue, click on the drop down menu arrow
(3) In the drop-down menu choose the Negative Darkroom option.

(10-26-2024, 11:40 AM)rich2005 Wrote: ...but does it work? Do the sliders change the image ?

Probably the version of Gimp you have installed, 2.10.36 That is the default version for ubuntu 24.04 and probably the snap version if you used the ubuntu software center.  Do you know is it is a snap ?

Not much you can do.
You could try the PPA version https://launchpad.net/~ubuntuhandbook1/+archive/ubuntu/gimp
or
The flatpak version from gimp.org
or
This appimage https://github.com/TasMania17/Gimp-Appimages-Made-From-Debs/releases/tag/Gimp-v2.10.38

otherwise back to using the color-curves tool.