High iso in photo vs video

Started 6 months ago | Discussions thread
Off The Mark Veteran Member • Posts: 6,084
Re: High iso in photo vs video

Vi Vy wrote:

Since the video resolution is half of a photo resolution does the image processor (pixel binning or something similar ? ) produce a less noisy video ?

As others have mentioned, there are a few different factors. It is going to depend on the camera, the codec, and the nose reduction tech used in the cameras.

But one concrete example which goes against your question is the Panasonic S1, which is capable of shooting in 6K or 4K.

The higher resolution 6K footage has less chroma noise than the 4K footage, when the 6K footage is then down-scaled in post to 4K. (When you shoot 4K in an S1, it is down-scaled in camera form a 6K sensor readout.)

There is also less noise if you compare the 6K footage to the 4K footage if they are both down-scaled to 1080p. (This is using DaVinci Resolve... don't know about other NLE's).

This is despite the fact that the 6K footage has lower chroma sub-sampling than 4K (10-bit 4:2:0 in 6K vs 10-bit 4:2:2 in 4K)

But then you get in to things like thermal management, since shooting at higher resolutions causes the sensor to heat up more than when shooting at lower resolutions, and heat generally leads to more noise.

That is one reason the S1 has a 15-minute time limit in 6K resolution so as to avoid noise generated from heat.

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