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Background Apple have created a public chunk, iDOT, which is in widespread use on macOS, iPadOS and and iOS, particularly for screenshots. Despite being public, it was never registered. The chunk has ...
documentation
needs resolved discussion
registration: new chunk
  • svgeesus
  • 9
  • Opened 
    on Jul 9
  • #530

Originally raised by John Bowler on the email list: I would also like to see some discussion of the issue raised by the now well established ACES AP0 profile. It is described here: https://acescentral.com/knowledge-base-2/aces-working-spaces. ...
bug
needs edits
needs testcase (wpt)
  • svgeesus
  • 9
  • Opened 
    on Jul 7
  • #527

I noticed both https://www.w3.org/TR/png-3/ as well as https://www.w3.org/TR/2025/CR-png-3-20250313/ (the most recent CR Snapshot) return a 404
  • JohnRiv
  • 6
  • Opened 
    on Apr 29
  • #516

This GitHub issue is to establish consensus on transitioning to Proposed Recommendation. W3C Working Group participants should reply with affirmation, dissent, or may abstain. Should we transition to ...
  • ProgramMax
  • 12
  • Opened 
    on Apr 14
  • #512

The example in Chapter 5.3 is mislabeled. The chunk cHNk should be marked as public, but it was mistakenly marked as private. https://www.w3.org/TR/png-3/#5Chunk-naming-conventions cHNk -- 32 bit chunk ...
invalid
  • yffufu
  • 2
  • Opened 
    on Mar 18
  • #510

I met with @bitbank2 who mentioned this. § 12.7 Filter selection says For images of color type 3 (indexed-color), filter type 0 (None) is usually the most effective. This isn t necessarily true. Filter ...
documentation
  • ProgramMax
  • 1
  • Opened 
    on Feb 21
  • #505

This GitHub issue is to establish consensus on publishing a Candidate Recommendation Snapshot. W3C Working Group participants should reply with affirmation, dissent, or may abstain. Should we publish ...
  • svgeesus
  • 12
  • Opened 
    on Feb 7
  • #503

In the original eXIf chunk proposal from 2017-Jun-15 (http://ftp-osl.osuosl.org/pub/libpng/documents/proposals/eXIf/png-proposed-eXIf-chunk-2017-06-15.html) there was an addition to the Security Considerations ...
  • ctruta
  • 2
  • Opened 
    on Feb 3
  • #497

From 1.3.6.2 fcTL Frame Control Chunk: x_offset and y_offset define the x and y position of the following frame. They are encoded as PNG four-byte unsigned integers. They must be greater than or equal ...
bug
  • svgeesus
  • 1
  • Opened 
    on Jan 31
  • #496

This is part of the more broad #493 discussion. A new chunk (named iEId, image extra id ) would be added to describe an ID that gets used by the iEXt chunk #494 . The iEId chunk starts with an ID number. ...
needs resolved discussion
  • ProgramMax
  • 7
  • Opened 
    on Jan 29
  • #495
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