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% vs IRE for a PD 170 sony


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#1 Gabriel Rochette

Gabriel Rochette
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Posted 28 September 2007 - 07:34 PM

Ok!
Whats happen with that...?????
If you looking carefully in the pd 170 set-up you will find the 7.5 and the 0 calibration..Thats ok!!! 7.5 is the standard for right broadcast black ...... and 0 is for stretch black... BUT... if you put the camera on a waveform !!!!!!!! SURPRISE when yoU ARE IN 7.5..THE WAVEFORM INDICATE aproxx...15 ire... and when the 0 is setting ..the waveform indicate 7.5.... What thats ?????????????
OK... IRE ara IRE but the pd 170 set up indicate % not IRE...
Please help me
Gabriel Rochette
Québec Canada
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#2 Michael Nash

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Posted 28 September 2007 - 09:16 PM

I'm not that familiar with the PD170, but some cameras automatically add a 7.5 setup to analogue output. So if you set the camera to 7.5 black and output that over composite or S-video, it goes out with additional 7.5 lift, bringing it up to 15. But I can't say for sure if this is happening with your camera.

Was this an analogue waveform taking a live feed from the camera? And was that waveform monitor set up correctly? Or was this a software waveform, reading imported footage?

Check the footage against the camera's color bars. If the black level of color bars is at 15, then something's going wrong downstream from the camera. If the color bars show black at 7.5 but black signal (like, with the lens cap on, GAIN "off") shows as 15, then something is set wrong in the camera.

15 IRE sounds pretty high even for improper pedestal in the camera. With black at 15 IRE you'd definitely see it on a monitor as milky gray. Was the gain turned on?
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#3 Gabriel Rochette

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Posted 29 September 2007 - 10:27 AM

Thanks Michael..
I do some test this week
Gabriel
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#4 Walter Graff

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Posted 19 October 2007 - 06:54 AM

Are you looking at the waveform as in a software program/eidtor such as Final Cut? If so than it has little to do with the real world if your material is going back to broadcast.
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