Notice of Meeting - ACES Gamut Mapping VWG - Meeting #22 - 7/30/2020

Discussions - ACESNext VWG – Gamut Compression/Mapping
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ACES Gamut Mapping VWG Meeting #22

Thursday, July 30, 2020
9:30am - 10:30am Pacific Time (UTC-4:30pm)

Please join us for the next meeting of this virtual working group (VWG). Future meeting dates for this month include:

  • TBD

Dropbox Paper link for this group:

We will be using the same GoToMeeting url and phone numbers as in previous groups.
You may join via computer/smartphone (preferred) which will allow you to see any presentations or documents that are shared or you can join using a telephone which will be an audio only experience.

Please note that meetings are recorded and transcribed and open to the public. By participating you are agreeing to the ACESCentral Virtual Working Group Participation Guidelines

Audio + Video
Please join my meeting from your computer, tablet or smartphone.
[https://global.gotomeeting.com/join/241798885]

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Recap:

  • @jedsmith merged his ‘kitchen sink’ version into the super-repo model dir for testing - please pull it down and give it a go: https://github.com/colour-science/aces-vwg-gamut-mapping-2020/tree/master/model
  • @daniele - have we settled on AP1 as the target primaries? If we chose others, could we help the hue shift? Consensus is that AP1 makes the most sense in an ACES based system, but open to other feedback.
  • This round of group testing - within Virtual Working Group Members - will be on all versions to hopefully narrow down to one set of curve + default settings for user testing
  • @nick has a branch with curve overlays to assist - will update when it’s merged to the super repo
  • Wider user testing framework: asking for feedback, please add your thoughts and other test operations to the Dropbox Paper
    • We should add inversion to the testing framework for compositing - and recompression in grading
  • Touched on invertibility. In regards to the archive, @daniele brought up that ourselves 20 years from now will be (hopefully) smarter than we are now, so we should archive what we are confident in and not what we think we’ll want later.
  • Shadow rolloff: default value is 0. Should we deal with pixels with all three negative values?
  • Threshold - start at 0 or 1? Asked for feedback - everyone has their own preferences. Interested in what different software packages do in their tools around these types of parameters. And what should it be called?
  • Distance sliders - cyan magenta yellow? But threshold RGB?

Here’s the link to recording/transcript.

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I will tag the repo shortly!

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