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How to fix noise issue.

darkdrahethickdarkdrahethick Posts: 24
in Technical Help (nuts n bolts)

If anyone can help me get rid of the noise in my photo let me know. I've tried messing with filtering, lighting, dof, environmental settings, mitchell, etc. Not sure how to get rid of the noise. Any help or suggestions thank you.

Easter2020.jpg
3840 x 2160 - 5M

Comments

  • takezo_3001takezo_3001 Posts: 1,997
    edited March 2020
    darkdrahethick said:

    If anyone can help me get rid of the noise in my photo let me know. I've tried messing with filtering, lighting, dof, environmental settings, mitchell, etc. Not sure how to get rid of the noise. Any help or suggestions thank you.

    There's a post denoise filter under the filtering menu item in the render settings... set the start iteration in increments of 8=>16=>24=>32 etc... You can even set it to 512!

    Post edited by takezo_3001 on
  • codex34_f5f1fb6f55codex34_f5f1fb6f55 Posts: 148

    Wow, that looks like when you don't have enough photon samples in mental ray.

    Anyway, with them being mostly yellow i'd guess the lighting is too high and they are reflection/refraction fireflies, so enable the firefly filter and try setting the firefly nominal luminance to 0.1, 0.01, 0.001 till they go away. It's 1,10,100 for not enough light.

    You can use the spot render (to new window in tool settings) to render small areas you know have issues.

  • darkdrahethickdarkdrahethick Posts: 24

    Thank you for the info, I had the firefly on, but the luminance wasn't lol. It did help get rid of the spots, but it lowered the quality and some spots are now blurry. Sorry to reply late, it takes my pc a long time to render open scenes in 4k imaging.

    Easter20.jpg
    3840 x 2160 - 8M
  • codex34_f5f1fb6f55codex34_f5f1fb6f55 Posts: 148
    edited March 2020

    Until you work out the cause of the fireflies, it's difficult to resolve without using filters, and filters blur things because that's what they do, they take samples from the surrounding area to 'fix' the problems and that smapling causes the bluring.

    I noticed in your render the areas which are in focus, mainly the grass and flowers, there are no issues, but there are where it is blurred you still get those firefly clusters, even with filtering.

    I'd suggest turning the hdr intensity down and use some in scene lighting to light the model better (turn shadows off on the lights)

    Forgot to ask, what is your hdr samples setting? 2048 or 512?

    Post edited by codex34_f5f1fb6f55 on
  • darkdrahethickdarkdrahethick Posts: 24

    Not sure if I'm answering the question correctly, but my threshold is 512-1024. When it renders it's suppose to use my GPU but it only uses my CPU some reason also (which makes it longer).

    Env lighting is 2048, Intensity 1, spectral render faithful, cie1964, filter mitchell 1, caustic sampler max path -1, and tone mapping is on. 

    Prog rend..PNG
    407 x 395 - 34K
  • lasersayspewlasersayspew Posts: 71

    You can try Intel Open Image Denoiser. In Blender it works like magic turning 100 iterations horribly noisy picture into a crystal clear one without blurring thanks to normal and albedo maps that Blender's engine can do. No such luck for DS and Iray but still, works pretty well, definitely better than the built-in denoiser of DS.

    mcasual has a script to use it right from inside DS on a done render. https://sites.google.com/site/mcasualsdazscripts9/mcjdenoise

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