Subject: [Cellar] Fwd: Re: FFV1 Version 4
From: Reto Kromer <[email-masked]>
To: [email-masked]
Date: Thu, 7 Jan 2016 19:37:06 +0100
List-Id: Codec Encoding for LossLess Archiving and Realtime transmission <cellar.ietf.org>

Sadly, there are around a lot of coding schemes:

- power function (= gamma function) encoded BT. 709, sRGB,
  CineGamma, "FILM REC", HyperGamma

- log RGB (= "quasi-log", sometimes also called "pseudo-
  log") encodings: FilmStream (log60), ARRI log F, Panalog,
  Sony-log (= S-log), REDLOG, SI log90

- log neg encodings: Cineon printing density (CPD), "DPX",
  ARRI log C

Hope this helps, Reto

====== Forwarded Message ======
Date: 7.1.2016-01-07 19:19 CET
From: Reto Kromer <[email-masked]>
To: [email-masked]

Peter B. wrote:

>I'm not too experienced with non-linear color encoding, but
>in a recent presentation by Reto Kromer, he mentioned that
>"logarithmic" often just means "logarithmic-ish".

It's usually called quasi-log. Apart from the toe and
shoulder region, the curve is non-linear, yet no clear
provision is made for foot-room and head-room.

Best regards, Reto

AV Preservation by reto.ch
chemin du Suchet 5 | 1024 Ecublens | Switzerland
Web: http://reto.ch | Twitter: @retoch

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