Notice of Meeting - ACES Gamut Mapping VWG - Meeting #10 - 4/16/2020

Discussions - ACESNext VWG – Gamut Compression/Mapping
1

ACES Gamut Mapping VWG Meeting #10

Thursday, April 16, 2020
9:30am - 10:30am PT (Los Angeles time / UTC-4:30pm)

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

  • 4/23/20 5pm
  • 4/30/20 9:30am

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]

First GoToMeeting? Let’s do a quick system check: [https://link.gotomeeting.com/system-check]

Audio Only
You can also dial in using your phone.
Dial the closest number to your location and then follow the prompts to enter the access code.
United States: +1 (669) 224-3319
Access Code: 241-798-885

More phone numbers
Australia: +61 2 8355 1038
Austria: +43 7 2081 5337
Belgium: +32 28 93 7002
Canada: +1 (647) 497-9379
Denmark: +45 32 72 03 69
Finland: +358 923 17 0556
France: +33 170 950 590
Germany: +49 692 5736 7300
Ireland: +353 15 360 756
Italy: +39 0 230 57 81 80
Netherlands: +31 207 941 375
New Zealand: +64 9 913 2226
Norway: +47 21 93 37 37
Spain: +34 932 75 1230
Sweden: +46 853 527 818
Switzerland: +41 225 4599 60
United Kingdom: +44 330 221 0097

1 Like
2

Recap:

  • Announced VWG progress report to EMEA group - look out for a google doc / dropbox paper doc in the next week.
  • Spectral sensitivities and how they relate to camera gamuts are not really helpful in our endeavor (A ‘Warning: IDT!’ buzzer was suggested - thanks @daniele )
  • Problems, like the blue-purple artifacts, should therefore be handled differently
  • @daniele posed that HSV is a problematic projection for modifying colors in and instead suggested investigating opponent spaces. HSV might still be useful to provide the saturation component as a multiplication factor in the opponent space.
  • Opponent color spaces that use a 0-1 domain could still be used by normalising the RGB component to the max value of the triplet. This could help in maintaining exposure invariance.
  • Scope: where do we stand on parameterization? Parameter selection would need to be communicated down the line. Maybe later with AMF, but no reliable method now. Perhaps keep it to limited choices based on the target gamut (maybe auto-selected based on e.g. ODT?)
  • Should the MVP provide invertibility? Daniele says Filmlight develops with an inverse in mind, but often end up not using it / using a modified version depending on the situation.
  • Where do we apply this transform in a production color pipeline? Discussion to be continued.
2 Likes
3

By way of saying hello, as my first post on ACES Central, I just wanted to express my enthusiasm for the open nature of this community. I’ve spent the last couple of days watching all the GoToMeeting recordings and reading the Dropbox Papers, checking out the research documents – I always wanted to be able to listen in on the work of colour scientists and now I feel like I’ve finally had that opportunity. Thanks to all involved!

1 Like