News and History of the PNG Development Group from 2025

Herein lie news items and historical stuff primarily of interest to the Portable Network Graphics Development Group itself. Feel free to poke around even if you're not a member, though. Note that some of the links, particularly the older ones, are broken; in some cases this is explained by later entries. Other links (CompuServe, tcg.arl.mil) have fallen prey to reorganizations or upgrades; should they ever reappear, the entries below will be updated as needed.

On the other hand, keep in mind that this is history here...updates to older entries are really not a priority these days.

• current - see here

• 13 June 2025 - libpng 1.6.49 is released with a new SIMD-optimized delta-filtering implementation for the RISC-V architecture.

• 1 May 2025 - libpng 1.6.48 is released with a fix for a floating-point bug in the setter of the mDCv chunk. Thanks to Travis CI for five years of free automated verification on various platforms, and to AppVeyor CI for their ongoing verification on Windows.

• 18 February 2025 - libpng 1.6.47 is released with full support for the PNG-3 specification, including new mDCV and cLLI chunks and updated colorspace behavior.

• 10 January 2025 - libpng 1.6.45 is released with support for the new PNG-3 colorspace chunk cICP, courtesy of Lucas Chollet and John Bowler.

Here are some related PNG pages at this site:

• Current News of the PNG Development Group
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Copyright © 1995-2025 Greg Roelofs.