EDDUS RAY Posted August 26, 2012 Share Posted August 26, 2012 (edited) 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 August 26, 2012 by Judson Lee Link to comment Share on other sites More sharing options...
Phillip Jackson Posted August 27, 2012 Share Posted August 27, 2012 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. Link to comment Share on other sites More sharing options...
EDDUS RAY Posted September 12, 2012 Author Share Posted September 12, 2012 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. Link to comment Share on other sites More sharing options...
Premium Member Bruce Southerland Posted September 23, 2012 Premium Member Share Posted September 23, 2012 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. Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted September 23, 2012 Premium Member Share Posted September 23, 2012 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. Link to comment Share on other sites More sharing options...
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