Hi,
thanks for writing. Here's the images first from the camera direct , a flat profile no editing. The second is the key, I've just done this quickly so I know it's not perfect but you can see the main body of the white area is clean. And on the final picture the noise comes in on the darker wood and seat areas plus the strings.
It's on a 16 bit channel, I tried 32 bit didn't make a difference.. I have done green screen before, I added the key to show I'm not making a basic error.
It actually appears that adding keylight , or a spill suppressor ..makes the footage grainy ? I hope it's my workflow, then I can correct it . I've not used 4:4:4 footage before.. ? Thinking out loud..possible codec issue ?
Thanks again for getting involved ,
David