Re: Specifying an API to query the display color volume

These values are max luminance (for a small area)

Max for full white screen is not going to be meaningful.

 

235 – found in some Sony document

300 – SDR TV as told by Netflix

720 – LG OLED

These are not standardized values.

 

We can list standardized values.

Also, we can provide a ladder of rounded values. They need to be spaced close enough for good tone mapping, spaced far apart to prevent finger-printing.

Maybe 20-30% increments?

 

Lars

 

On 9/8/23, 10:40 AM, "Benbuck Nason" <bnason@netflix.com> wrote:

 

EXTERNAL: Use caution when clicking on links or opening attachments.

 

Maybe also adding 2000 and 4000 nits (some mastering environments) and 10000 nits (PQ) would make sense?

 

-Benbuck

 

On Fri, Sep 8, 2023 at 5:49 AM Chris Lilley <chris@w3.org> wrote:


On 2023-09-08 05:25, Lars Borg wrote:
> I suggest that the list includes the following nominal max values: 48, 
> 80, 100, 160, 203, 235, 300, 500, 600, 720, 1000

I get where some of these come from (48 is the DCI-P3 projector, 80 from 
sRGB, 100 in various places as "SDR max luminance", 160 is Adobe (1998) 
RGB white luminance, 203 is HDR Reference White from BT.2408-5).

500,600,1000 are the minimum peak luminance VESA DisplayHDR performance 
levels (but 400 and 1400 are missing).

Could you explain 235, 300 and 720 please?

Also when we say max, do we mean max full-screen or max restricted area?

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