Any suggestions or updates?

Yeah me too I noticed same

Unfortunately it is the property of the advanced keyer that it emphasis the original noise in the footage. We will try to improve it in the future.

What you can do now is making sure that the noise of the original footage is as small as possible.

You can achieve this by leaving the "gain" setting in your camera on 0. (and/or decrease your iso) If the result will be too dark then you should compensate it by opening the aperture or adding more light to the scene.

has there been any new input on this? i notice a large difference in after-key noise between a blackmagic ursa 4.6k, and a blackmagic studio camera 4k pro. the 4k pro is much noiser after keying. it's a smaller sensor, but is very clean before the key, and the gain is set to 0. 

@Derren Levine: You need to ETTR (expose to the right), near the point of clipping. Set the camera to log gamma, then apply an exposure compensated LUT in Aximmetry to bring the footage back to the correct exposure again. Green screen doesn’t need all that dynamic range available in the camera, so you should use some of it to lower the noise floor instead. 

@twentystudios

thanks i'll give that a shot

where in axi are you applying the LUT? 

Use the color mapper module to apply the LUT, preferably before the keyer, since it’s hard to key log footage. For the tracked camera compound you’ll need to edit it to insert the LUT at the correct point. 

Hi,

This comment details how and where to insert the color mapper module for LUT: https://my.aximmetry.com/post/2032-add-new-color-spaces-and-gamma-curves-to

It is described for virtual camera compounds, but the tracked camera compound won't differ much.

Warmest regards,