RE: Help with HLG profile

Hi Simon,

I see that Lars has answered some of these questions in another email. As you may know, Lars has already done significant work in this area and has developed a method for HDR image colour management using ICC V4 that seems to be quite robust. I believe that this is used for some aspects of colour management in Adobe products (and probably others) and that a similar approach may be useful for your application.

As we speak, I am not aware of any iccMAX implementation that is supported by more than one company. The main problem is that iccMAX has a very broad range of functionality and typically only a subset of this functionality is required for any given application domain. The ICC is currently developing a set of interoperability conformance specifications (ICSs) that may address this problem. These define requirements for profile creation and colour conversion software for a number of application areas.

On the other hand, some aspects of ICC V4 (and V2) are widely supported and these may provide a sufficiently useful starting point for your work. My suggestion would be to start with V4 and look at what can be achieved with that. I would also recommend that any limitations in the workflow be identified, as such a list could be used to inform the development of an ICS for HDR imaging. If it would be of interest, I would be very happy to work with you on this approach.

Best regards,
_Craig

From: Simon Thompson-NM <Simon.Thompson2@bbc.co.uk>
Sent: 01 October 2018 14:42
To: Leonard Rosenthol <lrosenth@adobe.com>; Max Derhak <Max.Derhak@onyxgfx.com>; public-colorweb@w3.org
Subject: 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<mailto:lrosenth@adobe.com>>
Sent: 25 June 2018 18:08
To: Max Derhak <Max.Derhak@onyxgfx.com<mailto:Max.Derhak@onyxgfx.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

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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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