Re: [EXTERNAL] [PNG] Upcoming meeting topics (Fourth Edition)

Dimitri pointed out that PNG does not seem to have support for T.35
metadata. It might be a good idea to add that as well.

Cheers,
//Leo

On Thu, 27 Mar 2025 at 16:32, Seeger, Chris (NBCUniversal) <
Chris.Seeger@nbcuni.com> wrote:

> Also, a bunch of us would like to suggest adding “Gain Curves” with “Gain
> Maps”.
>
>
>
> -Chris
>
>
>
>
>
> *From: *Chris Blume (ProgramMax) <programmax@gmail.com>
> *Date: *Thursday, March 27, 2025 at 9:25 AM
> *To: *Seeger, Chris (NBCUniversal) <Chris.Seeger@nbcuni.com>
> *Cc: *Portable Network Graphics (PNG) Working Group <public-png@w3.org>
> *Subject: *Re: [EXTERNAL] [PNG] Upcoming meeting topics (Fourth Edition)
>
> Works for me :)
>
>
>
> On Thu, Mar 27, 2025 at 8:51 AM Seeger, Chris (NBCUniversal) <
> Chris.Seeger@nbcuni.com> wrote:
>
> Hi Chris B.,
>
>
>
> I’d like to suggest changing dWLm to rWtm (Reference White Metadata).
> This follows discussions in other standards groups.  HDR Reference White
> Metadata would describe diffuse white values other than “Nominal HDR
> Reference White” which equals 203nits.
>
>
>
> Best,
>
> Chris Seeger
>
>
>
> *From: *Chris Blume (ProgramMax) <programmax@gmail.com>
> *Date: *Thursday, March 27, 2025 at 7:52 AM
> *To: *Portable Network Graphics (PNG) Working Group <public-png@w3.org>
> *Subject: *[EXTERNAL] [PNG] Upcoming meeting topics (Fourth Edition)
>
> Hello everyone,
>
> We are cutting a feature branch for Third Edition and continuing work onto
> Fourth Edition.
> So our topics for discussion are Fourth Edition items:
>
>    - negative cHRM values
>    - Inserting deflate restart markers into a stream where a new scanline
>    with compatible filter allows -- add new chunk to indicate the location of
>    those restart markers
>
>
>    - possibly also not at scanline w/ compatible filter locations --
>       we'll want to gather information on deflate decode time vs. other png work
>       time to see if parallelizing just that portion is worth it
>
>
>    - Compression methods other than deflate
>    - Gain maps
>    - Generic image data
>    - dWLm
>
> Possible other topics which have been mentioned but aren't in a Github
> issue:
>
>    - Boundaries other than scanlines. For example, blocks.
>
>
>
> There are probably more topics I'm forgetting right now. Feel free to
> reply with them so they get included. But this will be more than enough for
> one meeting. :)
>
> See you Monday!
>
>