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Forums Broadcasting Australia broadcast luma and chroma limits

  • Australia broadcast luma and chroma limits

     Andrew Rendell updated 8 years ago 2 Members · 4 Posts
  • Craig Ricker

    February 15, 2013 at 5:53 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

  • Andrew Rendell

    February 17, 2013 at 5:46 pm

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

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

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

  • Craig Ricker

    February 18, 2013 at 2:14 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

  • Andrew Rendell

    February 19, 2013 at 7:00 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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