Re: [PNG] Meeting discussion topics

On 2024-09-28 18:07, John Bowler wrote:
> Absolutely nothing.  I don't think that was Chris's point.  However 
> you might care to explain how to encode a volume expressed in the ACES 
> AP0 primaries.  Completely off topic of course.

You can't, of course, because of the negative y component for blue. AP0 
is even wider than ProPhoto (which /can /be encoded in PNG). From SMPTE 
ST2065-1.2021:
https://doi.org/10.5594/SMPTE.ST2065-1.2021

Table 1 — ACES RGB primaries chromaticity values
Red     x  0.7347     y  0.2653
Green   x  0.0        y  1.0
Blue    x  0.0001     y –0.077

-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media