Error create B&N

when I use colour balance for B&W the screen turns black.

It does not happen if I use filters (which I have created as a user) in the colour calibration module. Also not if I use LUA for black and white film filter.

Any suggestions?

DT version 3.5 (git 2597)

are you using opencl? try darktable-cltest from the commandline to get this.
i can reproduce this if i force my mac to use the intel gpu

Workaround: check “clip negative RGB from gamut”

Yes, and running the darktable-cltest does not give any errors…

Yeaaah, this has been the solution, Thank you very much.


i filed an issue for that. I just was able to reproducte this with the intel on-cpu-gpu.
You can check, which device is in use running
darktable -d opencl | grep -e'dev_process_' -e'using device' -e'opencl_init'
it seems you’re using osx. can you confirm it’s the intel device that fails?

I run Linux on an AMD cpu and NVidia graphics card and I can reproduce this.

I added this info to your GitHub issue.

I am using AMD with NVDIA graphics.

This is the result of the device:

0.207041 [opencl_init] kernel loading time: 0.0208
0.207047 [opencl_init] OpenCL successfully initialized.
0.207048 [opencl_init] here are the internal numbers and names of OpenCL devices available to darktable:
0.207049 [opencl_init] 0 ‘GeForce RTX 3070 Laptop GPU’
0.207050 [opencl_init] FINALLY: opencl is AVAILABLE on this system.
0.207052 [opencl_init] initial status of opencl enabled flag is ON.

the b/w presets are updated in 3.6.
see Disabled clip negative GRG from gamut makes image black · Issue #9315 · darktable-org/darktable · GitHub

Thank you for the immense work of the developers.