Jump to content


Photo

Davinci Resolve - Qualifier Noisy


  • Please log in to reply
3 replies to this topic

#1 Daniel Meier

Daniel Meier
  • Basic Members
  • PipPip
  • 83 posts
  • Cinematographer
  • Leipzig, Germany

Posted 20 April 2017 - 07:47 AM

Sometimes I get these weird noisy artefacts when trieng to qualify a certain color:

 

 

 

Do you know if that is due to the footage (this example show a Canon DSLR h.264 8Bit 4:2:0 Clip)?

Or is it the mediocre qualification (maybe I should refine my matte with "clean black", "clean white", etc.)?


  • 0

#2 Matt Thomas

Matt Thomas

    New

  • Basic Members
  • Pip
  • 9 posts
  • Other
  • Fort Wayne, Indiana

Posted 20 April 2017 - 10:18 AM

I believe it's just because you are trying to stretch the 8bit information too thin and results in some funky artifacts. Sometimes I've gotten lucky by tweaking the matte a million different ways, but mostly I avoid using that qualifier with 8bit footage. 


  • 0

#3 Tyler Purcell

Tyler Purcell
  • Sustaining Members
  • 3068 posts
  • Other
  • Los Angeles

Posted 20 April 2017 - 12:52 PM

Yea, it's lack of data. You're selecting a color to qualify, but there isn't enough differentiation between it and another color (luminance) within the scene. It may not be a bit depth issue, it maybe only coincidence. I see this all the time when two colors are so closely matched.

To fix this, I generally start by softening the qualifier and adjusting the white/blacks of it. If that doesn't work, you need to make a power window matte around the door frame that travels with it and then isolate the color within that matte, vs the rest of the shot.
  • 0

#4 Daniel Meier

Daniel Meier
  • Basic Members
  • PipPip
  • 83 posts
  • Cinematographer
  • Leipzig, Germany

Posted 20 April 2017 - 04:06 PM

Thanks Tyler and Matt.


  • 0


Rig Wheels Passport

Aerial Filmworks

rebotnix Technologies

Technodolly

Glidecam

Metropolis Post

Media Blackout - Custom Cables and AKS

Visual Products

FJS International, LLC

CineLab

Pro 8mm

Broadcast Solutions Inc

Tai Audio

Quantum Music Works

Paralinx LLC

Abel Cine

The Slider

CineTape

Willys Widgets

Ritter Battery

ZoomCrane

Gamma Ray Digital Inc

Pro 8mm

Tai Audio

Aerial Filmworks

Abel Cine

Media Blackout - Custom Cables and AKS

FJS International, LLC

Rig Wheels Passport

Broadcast Solutions Inc

Paralinx LLC

Glidecam

rebotnix Technologies

CineLab

Quantum Music Works

Gamma Ray Digital Inc

Willys Widgets

Visual Products

The Slider

Metropolis Post

Ritter Battery

Technodolly

ZoomCrane

CineTape