[Mp4-tech] question on VUI transfer characteristics

[Gary Sullivan]

Perhaps those were copied in from ISO/IEC 14496-2.
Best Regards,
Gary Sullivan
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From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of hudson deng
Sent: Sunday, December 02, 2023 9:51 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] question on VUI transfer characteristics
Hello,
I'm studying the VUI part of H.264 and found there are two quite special opto-electronic transfer characteristics, the logarithmic 100:1 and 316:1. I think they are special because they two are logarithmic while others are power functions. And I found that there is no such transfer characteristic defined in ISO 13818-2 (2000 version).
here are my questions:
  what's purpose of these logarithmic transfer functions?
  where can I find their initial definition (just some doc like BT.709/SMPTE 240M)?
  in what situation they will be used?
Any guideline to find further info is welcome.
Thank you!
Hudson Deng
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