Jump to content


Photo

Zone System / Waveform monitor relationship


  • Please log in to reply
4 replies to this topic

#1 EDDUS RAY

EDDUS RAY
  • Basic Members
  • PipPip
  • 15 posts
  • Cinematographer

Posted 25 August 2012 - 07:22 PM

Does anyone have any information regarding the application of the Zone System to the waveform monitor? Do certain Zones fall over IRE brackets? I.E. Zone V @ say 50 IRE'S...?

Edited by Judson Lee, 25 August 2012 - 07:23 PM.

  • 0

#2 Phillip Jackson

Phillip Jackson

    New

  • Basic Members
  • Pip
  • 2 posts
  • Cinematographer
  • Chicago, IL

Posted 27 August 2012 - 11:01 AM

From my understanding no, that's not the case. IRE is a percentage based value for the video signal being broadcast and since each camera has a different dynamic range the values shown by the IRE will relate to each dynamic range differently. You'd have to do tests with a grey scale (with your shooting camera) to really be able to know how to read the IRE values in stops. This isn't even considering the fact that IRE are logarithmic and not linear so it won't 6 IRE = 1 stop throughout the waveform.
  • 0

#3 EDDUS RAY

EDDUS RAY
  • Basic Members
  • PipPip
  • 15 posts
  • Cinematographer

Posted 11 September 2012 - 07:09 PM

From my understanding no, that's not the case. IRE is a percentage based value for the video signal being broadcast and since each camera has a different dynamic range the values shown by the IRE will relate to each dynamic range differently. You'd have to do tests with a grey scale (with your shooting camera) to really be able to know how to read the IRE values in stops. This isn't even considering the fact that IRE are logarithmic and not linear so it won't 6 IRE = 1 stop throughout the waveform.


Thanks man, that make sense.
  • 0

#4 Bruce Southerland

Bruce Southerland
  • Sustaining Members
  • 42 posts
  • Director
  • Birmingham, AL USA

Posted 23 September 2012 - 10:13 AM

There's an article in the American Cinematographer video manual 3rd Ed. titled "How to use the zone system to predict
Video image contrast", which discusses the relationship of IRE units and the zone system, if you can get you hands on
one. I bought my copy on half.com.
  • 0

#5 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19761 posts
  • Cinematographer
  • Los Angeles

Posted 23 September 2012 - 10:58 AM

The other issue is whether you are applying the Zone System concept to a Rec.709 signal or a flatter Log gamma, which would contain more or less the total stops of DR captured.
  • 0


Aerial Filmworks

Tai Audio

FJS International, LLC

Visual Products

Ritter Battery

Rig Wheels Passport

Gamma Ray Digital Inc

Paralinx LLC

Opal

Glidecam

rebotnix Technologies

CineLab

Technodolly

Broadcast Solutions Inc

The Slider

CineTape

Metropolis Post

Abel Cine

Willys Widgets

Wooden Camera

Media Blackout - Custom Cables and AKS

Tai Audio

Glidecam

The Slider

Metropolis Post

Visual Products

Abel Cine

Broadcast Solutions Inc

rebotnix Technologies

Rig Wheels Passport

FJS International, LLC

Aerial Filmworks

Ritter Battery

Gamma Ray Digital Inc

Media Blackout - Custom Cables and AKS

CineLab

Opal

Technodolly

CineTape

Willys Widgets

Paralinx LLC

Wooden Camera