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Australia broadcast luma and chroma limits

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Craig Ricker
Australia broadcast luma and chroma limits
on Feb 15, 2013 at 5:53:04 am

Hi there,

Trying to find out what the broadcast safe limits are for luma and chroma in Australia.

Is it different per broadcaster?

Just want the gist:

is it 0-100 on luma

-20 to 130 on chroma?

Mac Pro 2 x 2.4Ghz, 16GB RAM, GTX 660


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Andrew Rendell
Re: Australia broadcast luma and chroma limits
on Feb 17, 2013 at 5:46:51 pm

AFAIK, the main broadcasters in Australia are members of the ITU, so regular Rec.709 levels are what they require.

http://en.wikipedia.org/wiki/Rec._709

http://www.itu.int/dms_pubrec/itu-r/rec/bt/R-REC-BT.709-5-200204-I!!PDF-E.p...


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Craig Ricker
Re: Australia broadcast luma and chroma limits
on Feb 18, 2013 at 2:14:12 am

So I had a read through that document. Didnt discuss DV Pal, rather it was in regards to HD broadcast, but assuming they wish to have the same levels I found this to be what they said.



So assuming I am reading this correctly, the levels for broadcast are not 0-255, but rather 16-235 for luminance.

Could not see what chrominance values are supposed to be?

I have heard to not go over 75% on the vector scope, though would like to know what values that means so I can simply apply the video limiter effect and set it up right.

Mac Pro 2 x 2.4Ghz, 16GB RAM, GTX 660


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Andrew Rendell
Re: Australia broadcast luma and chroma limits
on Feb 19, 2013 at 7:00:30 pm

Ah, didn't think of SD, but yes 16 - 235 is right.

75% on the chrominance is a decent rule of thumb.

TBH, I would advise against using clippers to set maximum levels without at least setting them roughly right first.

I don't know which video limit effect you're using, there are a few and they don't all set up the same.


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