Re: Specifying an API to query the display color volume

In the call we discussed enumerated color volumes.
We also need to enumerate max luminance values (to avoid fingerprinting)
I suggest that the list includes the following nominal max values:
48, 80, 100, 160, 203, 235, 300, 500, 600, 720, 1000

Lars

-----Original Message-----
From: Pierre Lemieux <pal@sandflow.com <mailto:pal@sandflow.com>>
Date: Tuesday, September 5, 2023 at 1:59 PM
To: "public-colorweb@w3.org <mailto:public-colorweb@w3.org>" <public-colorweb@w3.org <mailto:public-colorweb@w3.org>>
Subject: Specifying an API to query the display color volume
Resent-From: <public-colorweb@w3.org <mailto:public-colorweb@w3.org>>
Resent-Date: Tuesday, September 5, 2023 at 1:59 PM


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Good morning/evening,


In preparation for our call tomorrow and per my long overdue homework,
the PR below updates the strawman by adding an API to query the
display color volume:


https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fpull%2F106%2Ffiles%3Fshort_path%3D10f5ace%23diff-10f5ace43778941f0f6fcac87de875cf240b84fd998411026760e5a573e7c3a9&data=05%7C01%7Cborg%40adobe.com%7C1a44147be605407903d608dbae6c250b%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638295551726506682%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=JH%2Bb3EBA9Z2oUb6UkVqTCILzVpJDZPNKXOvVDcp719o%3D&reserved=0 <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fw3c%2FColorWeb-CG%2Fpull%2F106%2Ffiles%3Fshort_path%3D10f5ace%23diff-10f5ace43778941f0f6fcac87de875cf240b84fd998411026760e5a573e7c3a9&amp;data=05%7C01%7Cborg%40adobe.com%7C1a44147be605407903d608dbae6c250b%7Cfa7b1b5a7b34438794aed2c178decee1%7C0%7C0%7C638295551726506682%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=JH%2Bb3EBA9Z2oUb6UkVqTCILzVpJDZPNKXOvVDcp719o%3D&amp;reserved=0>


The proposed revision also clarifies that the platform is not expected
to perform color volume mapping (i.e. change the colors of the image)
if the image color volume is a subset of the display color volume (as
determined by the API above).


Best,


-- Pierre