Denoiser - two problems.

[joecharon]

Hi. I found new denoiser very useful. However, i found these two problems:

- it washes out texture details behind the glass

- it overexposes strong lit surfaces

Render elements method was used with strong preset.

On Gym image you can see how it washes stone texture behind the window
while on leisure room you can see how it overexposes areas with the sunlight.
Best regards,

[vlado]

Render elements method

That's the problem there... you might have color mapping enabled (f.e. the Burn value is less than 1.0) which alters the way elements are composited together. I should have really put a warning about this, until I figure out what, if anything, can be done about it. The single-pass method doesn't have this issue. Or you can apply the Burn in the frame buffer, not in the render.

Best regards,
Vlado

[joecharon]

Thanks Vlado, i have rendered new set of pure linear images.
You were right about overexposed areas. Now it works fine.
But it still washes testure details behind the glass. See the column on the gym image please.
Best regards,

[vlado]

Yep, the denoiser doesn't see as well through glass as it does directly visible surfaces (f.e. the diffuseFilter element is black there). There's still some research to be done on how to improve that. Overall, it still seems to do a good job on your image.

Best regards,
Vlado

[joecharon]

Yes it realy does. I`m happy with it. I have already rendered some final production images and it helped a lot!
Best regards,

[^Lele^]

If they are stills (or not! eheh.), make yourself a multimatte of the refractive objects, and denoise the image twice, the second time with RGB-Only mode, then comp the two together.
RGB-Only isn't so put off by refraction, and may give you a better result for those specific areas.
Multimattes will make the recomping a matter of seconds.