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How to remove fireflies while keeping the lighting and resolution?

DefaultNameDefaultName Posts: 403
edited February 2019 in Technical Help (nuts n bolts)

[How to remove fireflies while keeping the lighting and resolution?] I've tried firefly enable, and I'll be letting it render longer. Anything else you guys know, or that I might be overlooking? Thank you!

Post edited by Richard Haseltine on

Comments

  • Richard HaseltineRichard Haseltine Posts: 107,971

    Assuming you have an nVida GPU that will handle the scene have you tried the new denoiser in the 4.11 Public Beta?

  • kenshaw011267kenshaw011267 Posts: 3,805

    Fireflies are one thing and occur in one part of a render.

    Uncoverged pixels are another thing and occur more broadly across the whole render. 

    Do you know which you have?

  • TSasha SmithTSasha Smith Posts: 27,247

    Oh those fireflies not the 3D models of bugs!  So I am confused.

  • Rascal3DRascal3D Posts: 290

    "...while keeping the lighting and resolution?"  -- that's tricky.  Usually adjusting (increasing) the amount of light or changing the HDRI map (if you are using one -- to a higher resolution map) can reduce the number of fireflies.  The other trick is to double/quadruple the render size dimensions and then take the final rendered image into photoshop or Gimp and reduce its size by half.  But if you can't change these two parameters (lighting and resolution) then you could always take you final rendered image and eliminate the fireflies manually using the clone brush in photoshop.  

  • JonnyRayJonnyRay Posts: 1,744

    One trick that I use for static images is to render about 50% larger than I want my final image, then scale it. The downsampling of the pixels will average out some of the noise, althought it may not completely eliminate it. That's harder for animation of course.

    Another is that if you want a dark / high contrast picture, render with more light and then adjust the exposure in post processing. Learning to use canvases and layer the images in post work can also help a lot to maintain your desired look but improve the overall quality.

  • fastbike1fastbike1 Posts: 4,078

    Put more light into the image and use tonemapping to get the final effect. If the render hits the time limit, allow more time.

  • Those ThingsThose Things Posts: 1,146

    If you have Photoshop Creative Cloud, you can use a color range selection to select just the individual firefly pixels in your finished image. Then, use a content-aware fill on them.

  • nemesis10nemesis10 Posts: 3,773

    Here is an interesting take on the topic: https://thinkdrawart.com/why-is-there-noise-in-my-daz-studio-iray-render-and-how-to-remove-it

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