Re: [w3ctag/design-reviews] [wg/png] PNG Working Group Charter (Issue #1143)

christianliebel left a comment (w3ctag/design-reviews#1143)

@svgeesus Thanks for your patience. Here is our review:

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This is a charter update for the PNG Working Group, which maintains one of the key graphics formats used on the web and beyond.

Specifically, the Working Group plans to deliver two new editions of the PNG specification:
* An improvement of the interoperability of High Dynamic Range (HDR) and Standard Dynamic Range (SDR) in PNG Fourth Edition, an update expected to be minor.
* An improvement of compression and decompression in PNG Fifth Edition, a larger effort that may lead to smaller image files and faster opening times, but may break compatibility with existing image creation and consuming software.

The TAG welcomes the improvement in HDR/SDR compatibility but is concerned about the breaking change regarding the compression algorithm. We agree with https://github.com/w3c/png/issues/39#issuecomment-2674690324 that introducing such a change would basically create a new format. For this new compression to be worth it, it needs to clearly outperform other newer image formats like WebP and JPEG XL. The benefits need to be clear and strong enough to make a breaking change worthwhile.

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