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February 24th, 2010, 08:29 AM
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#1 |
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Equal Opportunity Offender
Join Date: Feb 2009
Location: Brisbane, Australia
Posts: 3,065
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Black levels for video (0 IRE and 7.5 IRE)
I stumbled across this 5 minnute tutorial by JVC and it's made me think ... which I am not sure that I really like to have to do.
Have a look at http://pro.jvc.com/pro/attributes/pr...p/JVC_DEMO.swf The question is ... is this still and issue and how exactly can we tell if the black levels issue is going to bite us? Andrew |
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February 25th, 2010, 12:12 PM
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#2 |
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Inner Circle
Join Date: Aug 2005
Location: Atlanta/USA
Posts: 2,515
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Both questions are fully answered right there in the tutorial. Yes, this is an issue and will bite you if you don't pay attention.
How can you tell? Easy - look at your scopes in the NLE. |
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February 25th, 2010, 01:32 PM
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#3 |
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Inner Circle
Join Date: Mar 2003
Location: Ottawa, Ontario, Canada
Posts: 4,220
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IF you stay purely digital you don't have to worry. All digital is effectively 0 IRE. You still do have to manage the levels though as it is all too easy with colour correction etc to exceed the levels at both top and bottom making even the digital signal invalid. If you use the current set of consumer or Prosumer cameras they will all be set at 0 IRE. If you then edit and make DVD's or Bluray's then you need to stay at 0 IRE ( its really 16 as the tutorial says ). But you need to ensure that the range of your NLE output is still correct after colour correcting etc so you will need to use the Scopes in the NLE to make sure the final output is within digital 16 to 235 range.
IF you are going to record to or from analogue tape then you do have to manage the levels. Just as described in the tutorial. Ron Evans |
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February 26th, 2010, 02:44 AM
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#4 |
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Equal Opportunity Offender
Join Date: Feb 2009
Location: Brisbane, Australia
Posts: 3,065
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I suppose what I was really asking was .... is this an old tutorial/issue and has the issue been corrected by manufacturers in the meantime?
Andrew |
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February 26th, 2010, 08:36 AM
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#5 |
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Inner Circle
Join Date: Mar 2003
Location: Ottawa, Ontario, Canada
Posts: 4,220
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The issue is real today. Meaning if you use analogue tape or broadcast in North America you will have these issues. It has nothing to do with manufacturers product ( unless you mean the 7.5 setup switches on cameras). These are broadcast analogue specs for NTSC North America. Not true for digital as noted in tutorial etc. IF you shoot digital and stay digital then there is no problem. The playback equipment will correct if needed. IF you capture and mix analogue tape and digital then you need to make sure the levels are correct in the digital mix.
Ron Evans |
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