Re: [EXTERNAL] Re: PNG overview slides

To be fair, the way JpegXL and WebP do their lossless variants is almost
exactly how PNG compression works. We could ask the same of them--why add a
lossless variant when that is already well covered by PNG (especially if
they're going to compress similarly to PNG).

I don't have a firm answer for you. I think we'll want to explore and
debate.

I think a reasonable enough answer is: there are likely more areas to
explore than there are formats, currently. I can imagine lossy_format_1
being strong in use_case_1. And lossy_format_2 -> use_case_2, etc.

If my hunch there is correct (it very well may not be), we can try to pin
the specialized use cases that are important to W3C. And we can focus
(lossy) efforts on those fronts.

On Thu, Nov 13, 2025 at 10:07 PM Leonard Rosenthol <lrosenth@adobe.com>
wrote:

> Why does it need to be under the W3C umbrella?  We already have JPEG-XL
> and AVIF that meet those criteria and are supported by most/all browsers.
> What would be the benefit/use case for ANOTHER image format?
>
> Leonard
>
> *From: *Seeger, Chris (NBCUniversal) <Chris.Seeger@nbcuni.com>
> *Date: *Thursday, November 13, 2025 at 8:04 AM
> *To: *Chris Blume (ProgramMax) <programmax@gmail.com>, Chris Lilley <
> chris@w3.org>
> *Cc: *Portable Network Graphics (PNG) Working Group <public-png@w3.org>
> *Subject: *Re: [EXTERNAL] Re: PNG overview slides
>
> *EXTERNAL: Use caution when clicking on links or opening attachments.*
>
>
> Seems like it would be valuable to get a single image standard to support
> lossy and lossless under the W3C umbrella.  I’d like to see this move
> forward.
>
> *Chris Seeger*
>
>
> *From: *Chris Blume (ProgramMax) <programmax@gmail.com>
> *Date: *Thursday, November 13, 2025 at 1:05 AM
> *To: *Chris Lilley <chris@w3.org>
> *Cc: *Portable Network Graphics (PNG) Working Group <public-png@w3.org>
> *Subject: *[EXTERNAL] Re: PNG overview slides
>
> I have also prepared some slides for the 5th Edition roadmap. (I will
> likely update them further tonight. I want it to feel less "that's asking a
> lot" and more inspirational.)
>
> I didn't realize there was perhaps a slide design I should follow. :) oh
> well
>
> https://www.programmax.net/talks/png-5th-edition-roadmap/
> <https://urldefense.com/v3/__https://www.programmax.net/talks/png-5th-edition-roadmap/__;!!PIZeeW5wscynRQ!teSn4yviUBeJ8O9oZSwfJ9aKO0E-s15YjPBgNu1aE25KBHvIssFohlbOT0_RndqnlcdI20H5N-JmHbdKxCmf$>
>
> On Thu, Nov 13, 2025, 2:56 PM Chris Lilley <chris@w3.org> wrote:
>
> Slides for an overview of PNG 3rd Edition (plus what we have so far on
> 4th):
>
> https://www.w3.org/2025/Talks/TPAC/PNG-summary/
> <https://urldefense.com/v3/__https://www.w3.org/2025/Talks/TPAC/PNG-summary/__;!!PIZeeW5wscynRQ!teSn4yviUBeJ8O9oZSwfJ9aKO0E-s15YjPBgNu1aE25KBHvIssFohlbOT0_RndqnlcdI20H5N-JmHUriXr2b$>
>
> --
> Chris Lilley
> @svgeesus@mastodon.scot
> W3C Distinguished Expert, Color, Graphics & Fonts
> W3C Technical Programming Team, Core Web Design
>
>
>