Denoiser only on final pass

[philip_nel]

Hi there,

I've done an animation render a few months ago with version 1.8.2 (maybe even 1.8.1) - was happy with noise quality.
Yesterday with version 1.8.3 I had to do updates and brought in my settings via "Open scene as config only"

The only thing I changed was clicking the Denoiser setting in rendering tab "only final pass"
The result is significantly more noise grain - if I untick it, it looks much better.

Is this to be expected? I assumed the final image would have been the same quality?

[npg]

Some images would be helpful. Is it noisier compared to 1.8.3 without the "only final" option or compared to 1.8.2? Have you tried "open as config" with 1.8.2?

[philip_nel]

Hi npg, difficult to show the noise problem with stills - it's only really visible when viewing the animation.
1.8.3 is noiser with "only final pass" checked compared to unchecked option.

[npg]

We will try to reproduce this with our scenes...

[philip_nel]

Thanks npg,

The config file I loaded was version 1.8.2 (which didn't have the "final pass" option) which I loaded in to 1.8.3.
Not sure if that may be a factor.

When I disable "final pass" in 1.8.3 the noise level looks like the previous animation that was done in 1.8.2.
When I enable "final pass" the noise is noticably more.

[Alexander.Atanasov]

Hi philip_nel,

Can you please send us a scene where the issue easily reproduces and a video with the differences? You can use the support form from the Chaos Help Center and the support team will notify me when they receive your files.

Best regards,
Alexander