denoiser darkens images with custom bokeh

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boxfx
Licensed Customer
Posts: 277
Joined: Fri Apr 27, 2012 9:13 am

If a universal camera is used with a custom depth of field bokeh aperture texture, enabling the denoiser will cause the image to render darker than without it.

normal render
noise.jpg
denoised render
denoise.jpg
c4d 2025.1.2
octane 2024.1 r3
4090 565.90
setting.png
Attachments
denoisebrightness.zip
(5.23 MiB) Downloaded 544 times
boxfx
Licensed Customer
Posts: 277
Joined: Fri Apr 27, 2012 9:13 am

This is unrelated to samples, the full final shots rendered here are on 8000 samples and render cleanly with no noise. They go darker. The images attached to this bug report use fewer samples to show the problem quickly.

It is literally a darkening bug caused by the denoiser.
karl
OctaneRender Team
Posts: 396
Joined: Sun Oct 13, 2019 11:26 pm

Thanks for the report. This issue is a bug in Octane core and will be fixed for future releases. As a workaround until then, you can use a texture where none of the pixels are pure black (e.g. very dark gray).
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