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giovannis6224513
giovannis6224513
Known Participant
November 11, 2017
Answered

What are the limits of Luma and Chroma for broadcast and smartTV?

  • November 11, 2017
  • 2 replies
  • 4097 views

Hi men,

I'm trying to make some video files for smartTV in h264 and h265.

Can someone help me to configure the limits of luma and chroma?

What values ​​do I have to put in video limiter so that the image can be reproduced correctly?

For smartTV, do you have to use the legal limit?

Thank you very much

This topic has been closed for replies.
Correct answer chrisw44157881

for yours, couldn't you make a soft rolloff with curves? that's what I do. its subtle, but noticable.

you can also set levels effect output RGB 204 and transfer mode color to get chroma in limits as well. normalizes to the vectorscope 1st box no matter how much saturation you accidentally use.

premiere pro cc 2015.2 broadcast safe preset

CreativeCOW

2 replies

E
excited_Genie16B8
Legend
November 11, 2017

I've honestly never worried about it for TV playback.  I don't think it's really necessary.

R Neil Haugen
R Neil Haugen
Legend
November 11, 2017

True. And much of my work isn't for commercial b-cast either. But some ... needs to be within specs. At that point, knowing how is rather necessary.

Neil

Everyone's mileage always varies ...
E
excited_Genie16B8
Legend
November 12, 2017

I think it's only "necessary" if the project needs it.  Mine never do.

"Helpful" to know, I might agree with.  "Can't hurt" to know, definitely agree.

    R Neil Haugen
    R Neil Haugen
    Legend
    November 11, 2017

    Broadcast is broadcast ... unless you've got an actual HDR b-cast, which is still rather uncommon. I've got a couple things for you to try.

    At Adobe MAX, colorist Robbie Carman noted that although the limiter in Resolve is better ... and just well, works period ... they do enough work in PrPro that he's worked that a lot also. (A lot of his stuff is like NPB programs for National Geo, adverts for major networks, nearly all broadcast stuff.)

    He gave the setup that he and his minions use in PrPro:

    Video Limiter effect, change type of effect to Luma & Chroma, set Luma to 1 and 99 (min/max), Chroma to -5 and 105(min/max).

    Jarle Leirpoll, in a post I've seen, gave the following process for a simple 'hard limiter' ...

    For now, a black Color Matte with Blend Mode set to Lighten and a white Color Matte set to Darken will clip anything above 100 and below 0. I use this on top of an Adjustment Layer with the Video Limiter as a "hard limiter" thingy.

    Legal limit these days is 0-255, except for very few old-style places. Very uncommon.

    Neil

    Everyone's mileage always varies ...
      chrisw44157881
      chrisw44157881Correct answer
      Inspiring
      November 11, 2017

      for yours, couldn't you make a soft rolloff with curves? that's what I do. its subtle, but noticable.

      you can also set levels effect output RGB 204 and transfer mode color to get chroma in limits as well. normalizes to the vectorscope 1st box no matter how much saturation you accidentally use.

      premiere pro cc 2015.2 broadcast safe preset

      CreativeCOW

        R Neil Haugen
        R Neil Haugen
        Legend
        November 11, 2017

        I've done soft rolloff with curves also. I've had colorists tell me that does not always get all the spiked bits, though. So they typically like a soft-limiter as the first part of a limiter action, then a hard limiter to make sure no 'leakers' get through.

        But I think a key here ... is when using the Video Limiter or a Curves effect or something like that, if applied on the clip it needs to be 'below' any other color effects in the ECP. So it's the last thing touching color/brightness.

        Neil

        Everyone's mileage always varies ...
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