Blackmagic Forum

From what I have seen with this interesting camera, you do not need NR in post for ISOs 100-640 unless you push the picture hard, nor do you really need NR from 1250-2000.

But for these other ISOs it looks like light to heavy NR is needed, with the chroma NR making the largest difference. What Spacial and Temporal values should I put it at for each ISO?

Could it be a chart like this? And should I keep chroma and luma linked?

ISO 800: *%T, *%S
ISO 2500: *%T, *%S
ISO 3200: *%T, *%S
ISO 6400: *%T, *%S
ISO 8000: *%T, *%S
ISO 12800: *%T, *%S
ISO 25600: *%T, *%S

Thanks guys. I know it depends on the situation and exposure, but I do like general ballpark estimates so I can speed up my work.

I think you have to look at it and make a decision based on judgement. Often, you may find that there's more chroma noise than luma noise, so you can adjust that accordingly by unganging the controls.

I don't automatically throw NR on everything just because it's got a high ISO. In some cases, I might choose to just use SNR Y-mode only on the Blue channel, using a Splitter/Combiner node. Often, the Blue channel winds up as the noisiest channel, but it depends on the specific material and the color temperature settings.

Marc Wielage wrote:I think you have to look at it and make a decision based on judgement. Often, you may find that there's more chroma noise than luma noise, so you can adjust that accordingly by unganging the controls.

I don't automatically throw NR on everything just because it's got a high ISO. In some cases, I might choose to just use SNR Y-mode only on the Blue channel, using a Splitter/Combiner node. Often, the Blue channel winds up as the noisiest channel, but it depends on the specific material and the color temperature settings.

That does sound interesting. The only color noise that I usually find to be the greatest offending is blue and green. The reason that I do Luma NR is because I like a clean look, even in really low light. (If only there was a full frame pocket with the low noise of the Sony A7SIII but the Braw and big screen)

Alexrocks1253 wrote:Could it be a chart like this?

I'm skeptical. Exposure will have an impact on how much (and what kind) of NR is best for any given shot.

Additionally, I've got 400 ISO .braw shots from the P4K that are just gross with noise. I've seen the original Pocket less noisy at 1600 ISO! (I wonder if the uncompressed CinemaDNG of the original Pocket plays a part in that.)

Jim Simon wrote:

Alexrocks1253 wrote:Could it be a chart like this?

I'm skeptical. Exposure will have an impact on how much (and what kind) of NR is best for any given shot.

Additionally, I've got 400 ISO .braw shots from the P4K that are just gross with noise. I've seen the original Pocket less noisy at 1600 ISO! (I wonder if the uncompressed CinemaDNG of the original Pocket plays a part in that.)

Were they underexposed? I have not seen too bad of noise at ISO 400 and only start to see bad noise at around 800. I guess each person has their own limit to how noisy something could be.

Alexrocks1253 wrote:Were they underexposed?

Sort of. Exposed for sky, so the black car in the shot was definitely underexposed.

Jim Simon wrote:

Alexrocks1253 wrote:Were they underexposed?

Sort of. Exposed for sky, so the black car in the shot was definitely underexposed.

Ah! that makes sense then. If you were shooting Braw, you can push it to 800 or 1000 iso to expose for the car and the sky will still be there since it wasn't overexposed in the first place. IDK how much NR you would need for that, though.