How can i remove noise, fireflies?

[Mushlev]

I am totally new to blender, and i would like to know if there is any decent way to remove fireflies without any change on the final render...

for example: https://i.imgur.com/zeXIgtV.png

i know if i add more light, it will reduce them, but sometimes i want to make a scene with just a few candles, or just one lightbulb... and it always become too noisy

[Zenogias]

https://www.blenderguru.com/articles/7-ways-get-rid-fireflies/

It's a good question,May be I should stick this to the forum if it's possible.

[The Renderer]

There are quite a few things to consider but the easiest way is to simply turn off caustics. In the Render settings under Light Paths, there are two checkboxes called Reflective Caustics and Refractive Caustics. Turn them off. You usually don't need them anyways, and if you do it's better to fake them.

Another common reason for fireflies is that the light source is too small (not too dark), try making it larger.

Just go to Youtube and search for Blender fireflies, you'll find tons of videos about how to reduce them.

Noise on the other hand is something different, there are two ways to decrease it: Increase the sample size and/or turn on the de-noiser. But your image clearly has more of a firefly problem than a noise problem.

[phillippi2]

In the 'Render Layer' properties, there is a 'Denoising check-box/menu. Enabling gets rid of most noise, though it makes your image darker.

[Mushlev]

thank you all, the denoiser seems to work on noise really well, but also if there are small details on something, it makes them very blurry

[criticalphil]

Originally posted by Mushlev:

thank you all, the denoiser seems to work on noise really well, but also if there are small details on something, it makes them very blurry

yeah denoiser can cause some smuging you can turn it off and go to sampling options under render, set the indirect clamp to 1 see how it looks after that, if it is still full of fireflies put it up to 4.

for an example i rendered this frame without any indirect clamp

http://steamcommunity.com/sharedfiles/filedetails/?id=1284594285

and the same frame with the clamp set to 1

http://steamcommunity.com/sharedfiles/filedetails/?id=1284592975

[Mika]

SET indirect Clamp to 1, 2 or 3 (3 for small noise and 1 for big noise and artifacts)
Instead use Branch Path Tracing use only Path Tracing (this reduce most of noise and time render because get same quality like Branch with less samples, but your scene get little bit dark) Can help to use Limited GI instead Full GI but this get your scene more dark. And finally can use DENOISE (default) (don't use if your scene has too much noise)

[Mushlev]

setting the indirect clamp to some very high value (40) did a perfect job for me, while setting it to 1 or 2 made everything look like there is no reflection on anything... and i have no idea why, but denoising removed the curved objects from the render, and also turned some parts black and grey... but after all i made it with the indirect clamp, thank you

[mr whittie]

increase sampling to about 1000 samples, higher if your computer can handle it. somehow, mine can.

[Mika]

Originally posted by Mushlev:

setting the indirect clamp to some very high value (40) did a perfect job for me, while setting it to 1 or 2 made everything look like there is no reflection on anything... and i have no idea why, but denoising removed the curved objects from the render, and also turned some parts black and grey... but after all i made it with the indirect clamp, thank you

Curious, in my case when I put 0.01 value it removes all the lights (very dark) and if I increase the amount the filter decreases, if I put 5 or more its equal to deactivated.

The Denoise is only useful for static images and with little noise. The utility is to be able to reduce the samples and reduce time, using many samples doesn't have much effect and using few samples will make the image look distorted and horrible (the same happens if there is a lot of noise)

[criticalphil]

Originally posted by Mika:

Originally posted by Mushlev:

setting the indirect clamp to some very high value (40) did a perfect job for me, while setting it to 1 or 2 made everything look like there is no reflection on anything... and i have no idea why, but denoising removed the curved objects from the render, and also turned some parts black and grey... but after all i made it with the indirect clamp, thank you

Curious, in my case when I put 0.01 value it removes all the lights (very dark) and if I increase the amount the filter decreases, if I put 5 or more its equal to deactivated.

The Denoise is only useful for static images and with little noise. The utility is to be able to reduce the samples and reduce time, using many samples doesn't have much effect and using few samples will make the image look distorted and horrible (the same happens if there is a lot of noise)

i beg to differ, Samples does do a lot for the quality and the reduction of fireflies.

i am very curious to see the rest of you render settings as setting the indirect light to 0.01 shouldnt be removing all your lights, it should have a very very very little difference if any.

[Mika]

Increasing the number of samples doesn't always work. I have made renders with 4096 samples and still have noise, especially if you use emission materials. Above all the artifacts are the ones that you will never remove, you need use the indirect clamp. The configuration that I use is normal, I don`t usually touch much, only model and materials and then I adjust the samples to the minimum for quality / performance.

It's not the first time that blender does strange things to me, and I think it's will not the last.

EDIT: Not remove the light, only make the scene very dark.

[KingErectus]

u can use ctrl+B