Call for informal discussion: APNG

Chris Lilley <[email protected]> Thu, 14 Sep 2017 19:09:31 -0400
Newsgroups	gmane.comp.graphics.png.general
Message-ID	<[email protected]>
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This is a call for informal discussion on APNG - specifically, the three 
chunks acTL, fcTL, and fdAT.

These chunks have been discussed before, and voted on before. Per the 
rules for registration:

>   The same chunk cannot be brought up again for another discussion
>   period and vote either until a 180-day waiting period has elapsed, to
>   allow for implementation and testing, or until a substantial change
>   to the specification is made.

APNG failed voting on 20 April 2007, which is more than 180 days ago:

> FAILED
> APNG 20070405a
> ftp://ftp.simplesystems.org/pub/png-group/documents/
> png-apng-proposal-20070405a.txt
>
> Voting has closed on the APNG proposal.  There were 8 YES
> votes, 10 NO votes, no abstentions, and no ineligble votes
> cast.  The proposal has failed and the APNG chunks are not
> registered.

My reason for re-opening discussion is the "implementation and testing" 
part. APNG has since become widespread. Compared to animated GIF, it 
offers 24bit (and 48bit!) colors rather than 256, and full transparency 
rather than binary opacity.

Regardless of what we may think about the reduced capabilities relative 
to MNG, or the advisability of re-using an image type for animations, 
this is the current state of the world and it seems sub-optimal to me 
that the PNG specification and extensions documents continue to not 
reflect this. I would like therefore to kick off informal discussion, 
then a formal discussion period and (re)vote.

APNG continues to be supported in Mozilla Firefox (and other apps using 
the Gecko rendering engine), starting from version 3, June 2008.

APNG is supported by Safari (and other apps using the WebKit rendering 
engine) since version 8, October 2014.

In addition, native apps on MacOS X and iOS use native support for APNG, 
since iOS 10 and OS X Yosemite, October 2014.

APNG is now supported by Google Chrome (and other apps using the Blink 
rendering engine, such as Opera and Samsung Internet), starting from 
version 59, June 2017.

Microsoft Edge does not support APNG, but MS Edge Devs stated that this 
is "under review". Meanwhile, APNG displays in Edge as the first frame, 
which is the expected fallback behavior.

A starter document is attached to facilitate discussion.

-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture & Technology Team, Core Web & Media


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    <p>This is a call for informal discussion on APNG - specifically,
      the three chunks acTL, fcTL, and fdAT.</p>
    <p>These chunks have been discussed before, and voted on before. Per
      the rules for registration:<br>
    </p>
    <p>
      <blockquote type="cite">
        <pre> The same chunk cannot be brought up again for another discussion
 period and vote either until a 180-day waiting period has elapsed, to
 allow for implementation and testing, or until a substantial change
 to the specification is made.</pre>
      </blockquote>
    </p>
    <p>APNG failed voting on 20 April 2007, which is more than 180 days
      ago:</p>
    <p>
      <blockquote type="cite">
        <pre>FAILED
APNG 20070405a
<a href="ftp://ftp.simplesystems.org/pub/png-group/documents/" rel="nofollow">ftp://ftp.simplesystems.org/pub/png-group/documents/</a>
png-apng-proposal-20070405a.txt

Voting has closed on the APNG proposal.  There were 8 YES
votes, 10 NO votes, no abstentions, and no ineligble votes
cast.  The proposal has failed and the APNG chunks are not
registered.</pre>
      </blockquote>
    </p>
    <p>My reason for re-opening discussion is the "implementation and
      testing" part. APNG has since become widespread. Compared to
      animated GIF, it offers 24bit (and 48bit!) colors rather than 256,
      and full transparency rather than binary opacity.<br>
    </p>
    <p>Regardless of what we may think about the reduced capabilities
      relative to MNG, or the advisability of re-using an image type for
      animations, this is the current state of the world and it seems
      sub-optimal to me that the PNG specification and extensions
      documents continue to not reflect this. I would like therefore to
      kick off informal discussion, then a formal discussion period and
      (re)vote.<br>
    </p>
    <p>APNG continues to be supported in Mozilla Firefox (and other apps
      using the Gecko rendering engine), starting from version 3, June
      2008.</p>
    <p>APNG is supported by Safari (and other apps using the WebKit
      rendering engine) since version 8, October 2014.<br>
    </p>
    <p>In addition, native apps on MacOS X and iOS use native support
      for APNG, since iOS 10 and OS X Yosemite, October 2014.</p>
    <p>APNG is now supported by Google Chrome (and other apps using the
      Blink rendering engine, such as Opera and Samsung Internet),
      starting from version 59, June 2017.</p>
    <p>Microsoft Edge does not support APNG, but MS Edge Devs stated
      that this is "under review". Meanwhile, APNG displays in Edge as
      the first frame, which is the expected fallback behavior.</p>
    <p>A starter document is attached to facilitate discussion.<br>
    </p>
    <pre class="moz-signature" cols="72">-- 
Chris Lilley
@svgeesus
Technical Director @ W3C
W3C Strategy Team, Core Web Design
W3C Architecture &amp; Technology Team, Core Web &amp; Media</pre>
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