RE: Help with HLG profile

Hi all,

Apologies for the delays in replying to this list, I’ve been busy with events over the summer period.

We are interested in furthering this work and getting a usable solution that we can use for our Video on demand platforms.  Similar use cases are explained in this blog: https://medium.com/netflix-techblog/enhancing-the-netflix-ui-experience-with-hdr-1e7506ad3e8


Could I just ask:

  1.  What the security concerns are with using ICCmax calculator functions?
  2.  How far are we from widespread deployment of ICCmax?

Could I also check my understanding of the issues?

  1.  ICC v4.0 uses D50 as its PCS white point and 1D LUTs?
  2.  ICCmax allows D65 white points and a calculator function which allows parameters to be passed – this is useful for the Display transform which varies for different screen brightnesses and surround brightnesses.

Best Regards

Simon

From: Leonard Rosenthol <lrosenth@adobe.com>
Sent: 25 June 2018 18:08
To: Max Derhak <Max.Derhak@onyxgfx.com>; Simon Thompson-NM <Simon.Thompson2@bbc.co.uk>; public-colorweb@w3.org
Subject: RE: Help with HLG profile

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Well, that’s a problem since many CMMs will choose to avoid the calculator feature of ICC.Max for security concerns.  I would think that calculator would be a last resort for any new profile that is created.



Leonard



From: Max Derhak <Max.Derhak@onyxgfx.com<mailto:Max.Derhak@onyxgfx.com>>
Sent: Monday, June 25, 2018 10:17 AM
To: Leonard Rosenthol <lrosenth@adobe.com<mailto:lrosenth@adobe.com>>; Simon Thompson-NM <Simon.Thompson2@bbc.co.uk<mailto:Simon.Thompson2@bbc.co.uk>>; public-colorweb@w3.org<mailto:public-colorweb@w3.org>
Subject: RE: Help with HLG profile



Not algorithmicly (IE via a parametric curve).  You can create an interpolated lut for a specific display luminance.

Additonally - in V4 - getting it to scale based on relative luminance will require you to use the absolute intent and agreement (outside the spec) on what the media white point should be.



Max Derhak (PhD)
Principal Scientist



From: Leonard Rosenthol [mailto:lrosenth@adobe.com]
Sent: Friday, June 08, 2018 11:29 AM
To: Max Derhak; Simon Thompson-NM; public-colorweb@w3.org<mailto:public-colorweb@w3.org> <mailto:public





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