Diffuse and sharpen module does not work when export

[Toand007 (Tobias Andersen)]

Hi all

I see that other have had the same issue, but no useable response.

The effect from the diffuse and sharpen module does not seem to work when exporting.
Attached is an extreme example for illustration purposes.
In Darkroom I can see my changes with diffuse and sharpen module, but the jpeg after export only has some of this effect.

I get the message “tilling failed for module “diffuse”. output might be garbled”.

Any one knows how to solve it?
Running ver DT 3.8.1 on MacOS 10.10.5

Thanks

[hannoschwalm (Jens-Hanno Schwalm)]

Besides heavy cpu load the module needs a lot of ram. That’s the reason for the module failing.
BTW, v 4.0 is much better in many ways.

[kofa (István Kovács)]

Reviewing your settings after reading darktable 4.0 user manual - memory & performance tuning may help.

Edit: links for 3.8:
https://docs.darktable.org/usermanual/3.8/en/special-topics/memory/
https://docs.darktable.org/usermanual/3.8/en/preferences-settings/processing/
https://docs.darktable.org/usermanual/3.8/en/special-topics/opencl/performance/

[g-man]

One other thing to add, make sure you evaluate the image d&s settings at 100% zoom in darkroom.