Experiment: Noise levels

[Ondra]

Which image has less noise? And how big difference do you see?

1:



2:

[zzubnik]

By a slim margin, number two feels cleaner to my eyes, after tabbing between them in Photoshop for several minutes.

[romullus]

I think #1 has a little bit more uniform noise, so it seems like less noisy. But i'm very tolerant to noise, so for me, difference is almost imperceptible.

[ecximer]

№1.
the difference is noticeable, but not much.

[CiroC]

Nº1 for me. The render seems to have a better contrast.

[Juraj]

I also think number one, maybe because the 'grain' seems smaller to me ?
Brother thinks opposite (num2), he's not 3d artist.

[Benjamin_F]

I think number one is more homogeneous, especially near the window.

[johan belmans]

for me number one, but hardly noticeable

[juang3d]

I agree with Benjamin_F, i used the wall near the window to make my choice.
Number one for me :)

Cheers.

[Siahpoosh]

#1 , is there any difference in lighting ? i can see a different in candle shadow on the wall.

[Captain Obvious]

"LtWCJTK.png" is marginally noisier. I measured. It's something like 2.4 % more noisy.

edit: So that's image 1 that's cleaner.

[Ondra]

"LtWCJTK.png" is marginally noisier. I measured. It's something like 2.4 % more noisy.

edit: So that's image 1 that's cleaner.

How did you measure it without the reference image? If you have some reliable metric for estimating noise tell me, I can use it for adaptivity ;)

[steyin]

They look exactly the same to me.

[Stan_But]

My vote for first also

[pokoy]

No 1 feels cleaner, but no 2 seems to have a more uniform noise across the whole image.

[Siahpoosh]

look at this

[elindell]

1 also feels cleaner if I scrub back and forth between them, but honestly just eyeballing it they look of equal noisiness

[maru]

I think the two images are extremely similar in terms of noise but if I had to choose, I would pick #1. Looks like it has (at least perceptually) less noise in the direct lighted area near the window. But I wouldn't be surprised if Keymaster was testing us and the two images were identically noisy. ;)

[Ondra]

#1 is less noisy. It uses one trick from recent paper about sampling. It will be probably included in daily build soon

[Siahpoosh]

"LtWCJTK.png" is marginally noisier. I measured. It's something like 2.4 % more noisy.

edit: So that's image 1 that's cleaner.

How did you measure it without the reference image? If you have some reliable metric for estimating noise tell me, I can use it for adaptivity ;)

Maybe this could help :
http://homepages.inf.ed.ac.uk/rbf/CVonline/LOCAL_COPIES/VELDHUIZEN/node18.html

[Chakib]

I can see that the first image had a liiiittle bit less noise  than the second one, especially on the back of the chair.

[zzubnik]

Well, I guess I'm going blind. I really struggled to make out much overall difference. I think I need glasses!

[filipskrzat]

#1 is less noisy

[juang3d]

Awesome :D

Will this make the images look cleaner sooner?

Cheers

[cecofuli]

Maybe... are you working also on "noise pattern flickering" problem?  =^___^=

[Captain Obvious]

"LtWCJTK.png" is marginally noisier. I measured. It's something like 2.4 % more noisy.

edit: So that's image 1 that's cleaner.

How did you measure it without the reference image? If you have some reliable metric for estimating noise tell me, I can use it for adaptivity ;)

I just measured the maximum deviance between each pixels and its neighbours. It doesn't work for calculating the error in a single image (you need the reference image for that), but it works for checking which of two images have the greater variance.

[gabrielefx]

try to reduce the noise putting 50 ies or tiny emitters inside the room.

[Zom-B]

#1 is less noisy. It uses one trick from recent paper about sampling. It will be probably included in daily build soon

There is a very simple way to tell what image has less noise: File size for the PNG!
PNGs are super mega sensible to noise vs filesize ratio.

[cecofuli]

try to reduce the noise putting 50 ies or tiny emitters inside the room.

Can you explain better?

[boumay]

try to reduce the noise putting 50 ies or tiny emitters inside the room.

Yes it would be interesting to know more