Re: [EXTERNAL] Re: [PNG] Meeting topics - Jan 6, 2025

Thanks for the update Chris B!

I vote for releasing cICP first and delay mDCV and cLLI.

cICP is essential for identifying video formats.  The others are not.

Best,
Chris


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________________________________
From: Chris Blume (ProgramMax) <programmax@gmail.com>
Sent: Friday, January 3, 2025 3:45:17 PM
To: Portable Network Graphics (PNG) Working Group <public-png@w3.org>
Subject: [EXTERNAL] Re: [PNG] Meeting topics - Jan 6, 2025

Oh! There is another bit of good news.
I found out there is a way for the public to access specific Chrome usage stats<https://urldefense.com/v3/__https://chromium.googlesource.com/chromium/src/*/HEAD/docs/use_counter_wiki.md__;Kw!!PIZeeW5wscynRQ!oj0PGILUGdfDg5TuxHeS-4jjtlPjkRP7UiBeymFIGXRMrTKL3dQ41E_MPGc0kVZit9HsKXTgPOu4l6_m_srZ$>.
So I can write some Chrome code to check for malformed PNGs or PNGs with "mDCv" (old name), as examples.

I'm going to add checks for mDCv/mDCV & cLLi/cLLI soon.

On Fri, Jan 3, 2025 at 11:05 AM Chris Blume (ProgramMax) <programmax@gmail.com<mailto:programmax@gmail.com>> wrote:
Happy new year!

Some quick updates:

  *   Cosmin has joined the group! He is the main maintainer of libpng. Glad to have him on board
  *   All 3 known implementers of mDCv and cLLi have now moved to mDCV and cLLI
  *   libpng added support for cICP - a release will be made soon
  *   acTL no longer needs to arrive before PLTE

Heck of a good start to the year!


Discussion topics:

  *   Should the libpng release wait for mDCV & cLLI implementations? Or should those come in a later release?
     *   Chyron uses libpng and wants cICP, mDCV, and cLLI for the upcoming Olympics broadcast.
  *   Should cHRM values be changed to signed?
     *   I am still waiting on advice from the higher ups on what level of breakage is allowed.
  *   I introduced an error into the spec with one of my recent updates. I'll fix it.
  *   Once fixed, should we make a new snapshot for a potential candidate recommendation?
  *   If I can squeeze it in this weekend, I'll try to write up a strawman for generic image-type data.

See you all Monday at 11 Eastern!