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General HD (720 / 1080) Acquisition
Topics about HD production.

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Old November 16th, 2007, 05:59 AM   #1
Regular Crew
Join Date: Oct 2007
Location: Los Angeles, CA
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7.5 Ire

When making sure that I am within "legal" limits of blacks, is this something I can do in post or should i be concerned with it during the shoot itself? If I shoot with the zebra pattern, being sure there is a good amount of contrast in the image, am I ok then to make necessary adjustments in post, or do I need to set a 7.5 IRE during the shoot?
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Old November 16th, 2007, 07:10 AM   #2
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Do it in post if you have to. All digital is equivalent to 0 IRE. DVD's are equivalent to 0 IRE the player applies the required setup for NTSC TV's. The only time you may have a problem is going from the computer directly to tape ( like VHS)

Ron Evans
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Old November 16th, 2007, 02:37 PM   #3
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In most cases, the (misleading-named) "7.5 setup" setting on your camera should NOT be used. It will create non-standard digital levels.

2- There is no IRE in digital formats. Digital formats record in bits. The 7.5 IRE setup issue arises when you convert from those digital bits to analog... does digital black level (code 16 Y' for 8-bit Y'CbCr formats) get converted to 0 IRE, or does it get converted to 7.5 IRE?

3- See the article:

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