PNG Working Group Charter

The mission of the PNG Working Group is to maintain and develop the Portable Network Graphics (PNG) specification.

Join the PNG Working Group.

This charter is available on GitHub. Feel free to raise issues.

Charter Status See the group status page and detailed change history.
Start date 23 October 2023
End date 30 October 2025
Chairs Chris Blume (W3C Invited Experts)
Team Contact Chris Lilley (0.1 FTE)
Meeting Schedule Teleconferences: topic-specific calls may be held as needed.
Face-to-face: we may meet during the W3C's annual Technical Plenary week; additional face-to-face meetings may be scheduled by consent of the participants, usually no more than 3 per year.

Motivation and Background

To help stabilizing PNG Third Edition, which is already being implemented and is expected to move to CR in a few months, new PNG features will be developed in a Fourth Edition.

Scope

Maintain the PNG specification, folding in solutions to reported errata.

Add selected new features which will be broadly useful, are demanded by users, and have significant implementer interest.

When developing any new features, the stability and interoperability with existing image files and image creation and consuming software will be a primary consideration.

Work to ensure the PNG specification is well tested and widely adopted.

Out of Scope

The following features are out of scope, and will not be addressed by this Working Group.

    Changes that will invalidate existing files, editors, or viewers that conform to Portable Network Graphics (PNG) Specification (Second Edition).

Deliverables

Updated document status is available on the group publication status page.

Draft state indicates the state of the deliverable at the time of the charter approval. Expected completion indicates when the deliverable is projected to become a Recommendation, or otherwise reach a stable state.

Normative Specifications

The Working Group will deliver the following W3C normative specifications:

Portable Network Graphics (PNG) Specification (Third Edition)

Latest publication: 2023-09-21

Exclusion Draft: https://www.w3.org/TR/2023/CR-png-3-20230921/
associated Call for Exclusion on 2023-09-21 will end on 2023-11-20

Produced under Working Group Charter: https://www.w3.org/Graphics/PNG/png-2021.html

Portable Network Graphics (PNG) Specification (Fourth Edition)

Latest publication: no draft

Other Deliverables

Other non-normative documents may be created such as:

  • Use case and requirement documents;
  • Test suite and implementation report for the specification;
  • Primer or Best Practice documents to support web developers.

Timeline

  • February 2024: Candidate Recommendation for PNG Third Edition
  • September 2024: Proposed Recommendation for PNG Third Edition
  • March 2025: Requirements and Use Cases for PNG Fourth Edition
  • September 2025: FPWD of PNG Fourth Edition

Success Criteria

In order to advance to Proposed Recommendation, each normative specification is expected to have at least two independent interoperable implementations of every feature defined in the specification, where interoperability can be verified by passing open test suites, and two or more implementations interoperating with each other. In order to advance to Proposed Recommendation, each normative specification must have an open test suite of every feature defined in the specification.

There should be testing plans for each specification, starting from the earliest drafts.

To promote interoperability, all changes made to specifications in Candidate Recommendation or to features that have deployed implementations should have tests. Testing efforts should be conducted via the Web Platform Tests project.

Each specification should contain sections detailing all known security and privacy implications for implementers, Web authors, and end users.

Each specification should contain a section on accessibility that describes the benefits and impacts, including ways specification features can be used to address them, and recommendations for maximising accessibility in implementations.

This Working Group expects to follow the TAG Web Platform Design Principles.

Coordination

For all specifications, this Working Group will seek horizontal review for accessibility, internationalization, privacy, and security with the relevant Working and Interest Groups, and with the TAG. Invitation for review must be issued during each major standards-track document transition, including FPWD. The Working Group is encouraged to engage collaboratively with the horizontal review groups throughout development of each specification. The Working Group is advised to seek a review at least 3 months before first entering CR and is encouraged to proactively notify the horizontal review groups when major changes occur in a specification following a review.

Additional technical coordination with the following Groups will be made, per the W3C Process Document:

W3C Groups

Color on the Web Community Group
Ensure that PNG meets the needs for Wide Color Gamut (WCG) and High Dynamic Range (HDR) lossless raster imagery.

External Organizations

Libpng maintainers
Development will be undertaken in close cooperation with the maintainers of the libpng library, particularly regarding implementability, backwards compatibility, stability and security.
Original PNG specification authors
The PNG Working Group will encourage involvement by any original authors who are still interested in PNG specification maintenance and development, for example by granting Invited Expert status.
APNG specification authors
The PNG Working Group will encourage involvement by any APNG authors who are still interested in PNG specification maintenance and development, for example by granting Invited Expert status.
ISO/IEC JTC 1/SC 24
If the PNG specification still falls within the scope of work of SC24, explore the possibility of updating the PNG ISO Standard.
Society of Motion Picture and Television Engineers
The PNG Working Group will work with SMPTE in the area of High Dynamic Range (HDR) imagery.

Participation

To be successful, this Working Group is expected to have 6 or more active participants for its duration, including representatives from the key implementors of this specification, and active Editors and Test Leads for each specification. The Chairs, specification Editors, and Test Leads are expected to contribute half of a working day per week towards the Working Group. There is no minimum requirement for other Participants.

The group encourages questions, comments and issues on its public mailing lists and document repositories, as described in Communication.

The group also welcomes non-Members to contribute technical submissions for consideration upon their agreement to the terms of the W3C Patent Policy.

Participants in the group are required (by the W3C Process) to follow the W3C Code of Ethics and Professional Conduct.

Communication

Technical discussions for this Working Group are conducted in public: the meeting minutes from teleconference and face-to-face meetings will be archived for public review, and technical discussions and issue tracking will be conducted in a manner that can be both read and written to by the general public. Working Drafts and Editor's Drafts of specifications will be developed in public repositories and may permit direct public contribution requests. The meetings themselves are not open to public participation, however.

Information about the group (including details about deliverables, issues, actions, status, participants, and meetings) will be available from the PNG Working Group home page.

Most PNG Working Group teleconferences will focus on discussion of particular specifications, and will be conducted on an as-needed basis.

This group primarily conducts its technical work on GitHub issues. The public is invited to review, discuss and contribute to this work.

Decision Policy

This group will seek to make decisions through consensus and due process, per the W3C Process Document (section 5.2.1, Consensus). Typically, an editor or other participant makes an initial proposal, which is then refined in discussion with members of the group and other reviewers, and consensus emerges with little formal voting being required.

However, if a decision is necessary for timely progress and consensus is not achieved after careful consideration of the range of views presented, the Chairs may call for a group vote and record a decision along with any objections.

To afford asynchronous decisions and organizational deliberation, any resolution (including publication decisions) taken in a face-to-face meeting or teleconference will be considered provisional. A call for consensus (CfC) will be issued for all resolutions (for example, via email, GitHub issue or web-based survey), with a response period of one week, depending on the chair's evaluation of the group consensus on the issue. If no objections are raised by the end of the response period, the resolution will be considered to have consensus as a resolution of the Working Group.

All decisions made by the group should be considered resolved unless and until new information becomes available or unless reopened at the discretion of the Chairs.

This charter is written in accordance with the W3C Process Document (Section 5.2.3, Deciding by Vote) and includes no voting procedures beyond what the Process Document requires.

Patent Policy

This Working Group operates under the W3C Patent Policy (Version of 15 September 2020). To promote the widest adoption of Web standards, W3C seeks to issue Web specifications that can be implemented, according to this policy, on a Royalty-Free basis. For more information about disclosure obligations for this group, please see the licensing information.

Licensing

This Working Group will use the W3C Software and Document license for all its deliverables.

About this Charter

This charter has been created according to section 3.4 of the Process Document. In the event of a conflict between this document or the provisions of any charter and the W3C Process, the W3C Process shall take precedence.

Charter History

The following table lists details of all changes from the initial charter, per the W3C Process Document (section 4.3, Advisory Committee Review of a Charter):

Charter Period Start Date End Date Changes
Initial Charter 14 September 2021 31 August 2023 (none)
Charter Extension 14 August 2023 30 November 2023 none
Rechartered 23 October 2023 30 October 2025

Added PNG 4th Edition

Change log

Changes to this document are documented in this section.