FPWD Request for PNG 3rd Edition

[svgeesus]

Document title, URLs, estimated publication date

Portable Network Graphics (PNG) Specification (Third Edition)
https://w3c.github.io/PNG-spec/
Tues 25 Oct 2022

Abstract

This document describes PNG (Portable Network Graphics), an extensible file format for the lossless, portable, well-compressed storage of static and animated raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-colour, greyscale, and truecolour images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits.

PNG is designed to work well in online viewing applications, such as the World Wide Web, so it is fully streamable with a progressive display option. PNG is robust, providing both full file integrity checking and simple detection of common transmission errors. Also, PNG can store colour space data for improved colour matching on heterogeneous platforms.

This specification defines two Internet Media Types, image/png and image/apng.
https://w3c.github.io/PNG-spec/#abstract

Status

https://w3c.github.io/PNG-spec/#sotd (as ED)

Is it a delta specification intended to become a W3C Recommendation?

No

Link to group's decision to request transition

• Call for Consensus: publish First Public Working Draft PNG-spec#219

Information about implementations known to the Working Group

Widely implemented since 1995

[svgeesus]

Publication request sent 2022-10-17 pending approval, expected publication 2022-10-25 after moratorium ends

[svgeesus]

Shortname renamed from png to png-3 at request of webmaster.

[svgeesus]

ping @plehegar

[plehegar]

Approved

[svgeesus]

Published 25 Oct 2022

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