- From: Chris Blume (ProgramMax) <programmax@gmail.com>
- Date: Fri, 10 Nov 2023 13:37:42 -0500
- To: Leonard Rosenthol <lrosenth@adobe.com>
- Cc: Richard Geldreich <rich@binomial.info>, "public-png@w3.org" <public-png@w3.org>
- Message-ID: <CAG3W2KeRs7hh17Y4YsjanZQKtL0T+8ERLKg82-FVgUqS5btpvA@mail.gmail.com>
You are right. Rich had mentioned RGBE (rather than RGBA), where the E is a shared exponent. This is how the color model / data storage becomes a bit blurred. There are other *true* color models like YUV that are worth considering. And there are also other blurring-the-lines ideas like storing normal maps, motion vectors, etc (not really color). On Thu, Nov 9, 2023 at 10:47 PM Leonard Rosenthol <lrosenth@adobe.com> wrote: > Changing the serialization of the pixel data (e.g. half-floats, or even > full floats, from integers) is not the same thing as changing color models. > > > > > What other color models are we thinking about, Chris? > > > > Leonard > > > > *From: *Chris Blume (ProgramMax) <programmax@gmail.com> > *Date: *Friday, November 10, 2023 at 12:48 AM > *To: *Richard Geldreich <rich@binomial.info> > *Cc: *public-png@w3.org <public-png@w3.org> > *Subject: *Re: [PNG] Meeting topics - Nov 13th, 2023 > > *EXTERNAL: Use caution when clicking on links or opening attachments.* > > > > Of course! > That is part of what I meant for the color models section. You had > mentioned wanting to discuss it earlier so I wanted to include it. > > > > On Thu, Nov 9, 2023 at 2:15 PM Richard Geldreich <rich@binomial.info> > wrote: > > Hi Chris - Could we also talk about half float PNG's? I've got some new > developments that are very interesting. > > > > > > On Thu, Nov 9, 2023 at 1:37 PM Chris Blume (ProgramMax) < > programmax@gmail.com> wrote: > > Hello everyone, > > Our next meeting is this coming Monday at 11am Eastern. > > Topics: > > - We're going to try a new Zoom link. I'll include both the new link > and the old link in the calendar. If the new link doesn't work, try the old > link. > - How could/should we add additional color models? > > > - PNG currently has a list of color models. If we want to add more > color models, we could add to this list. That was the forward-compatibility > intended by the list. It is also what we do with cICP. > - But adding to the list would break existing codecs. The key > difference between this list and cICP here is without understanding an > update to the CICP list (or even the cICP chunk itself), a decoder can > still show an approximate representation. But a new item in the color model > list does not have an equivalent approximation. > - We could have a new chunk signal the new color model. And there > can be a fall-back approximate representation provided by the original > list. This is effectively what happens now for normal maps, half-floats, > etc. > > > - Marketing subgroup > > > - Stephanie is spearheading PNG Third Edition marketing. We're > thinking of creating a subgroup to discuss how we plan to spread the word. > Everyone in the main WG is welcome to join this subgroup. The intention of > a subgroup is to not spam the main group. > > > > Did I miss anything? Are there any other topics you all would like to > discuss? > > See you Monday! > >
Received on Friday, 10 November 2023 18:38:03 UTC