[PNG] Meeting discussion topics

Hello everyone,

It's been a while. We have a meeting this coming Monday.
Here are some discussion topics. I surely forgot some, so feel free to
reply and add topics.

   - We're waiting on a few ISO specs, as seen in the 4th edition meta-issue
   <https://github.com/w3c/png/issues/536>.
      - Fares, are you able to join? Any update?
   - Do we know when AOM's version of gain curves is expected?
   - C2PA metadata inclusion
      - Leonard, would you be able to join to discuss this?
   - Chris Lilley would like to add iDOT
   <https://github.com/w3c/png/issues/530>
   - We should discuss possibly supporting mismatched ICC profiles
   <https://github.com/w3c/png/issues/478>. For example a gray ICC profile
   in an RGB image which happens to only store grayscale values. Or an RGB ICC
   profile in a grayscale image, where only the R=G=B values are used.
   - We can probably make progress on:
      - SMPTE ST 2094-10 average luminance metadata
      <https://github.com/w3c/png/issues/311>. Should we recommend a
      specific tone mapping algorithm? (Not 2094-10?)
      - Is there some phrasing we can use to require a decoder be
      consistent with its choice of tone mapping algorithms when given the same
      chunks <https://github.com/w3c/png/issues/319>?


Again, chime in if I missed some topics. I feel confident I have.
Thanks! See you Monday!