"The most significant change is the introduction of robust HDR support via a new 4-byte cICP chunk (Coding-Independent Code Points). This chunk allows an image to explicitly define its color space, transfer function, and matrix coefficients. Chris Lilley, one of the original developers of PNG who contributed to the formulation of the new PNG specification, explained in a technical article how this enables accurate color rendering on the commonly available wide-gamut displays."
"In addition, the new specification formally standardizes Animated PNGs (APNGs). Previously an unofficial extension proposed by Mozilla, APNGs provide a lossless, frame-by-frame animation capability with support for 24-bit color and 8-bit alpha transparency. Developers now have an improved alternative to animated GIFs. Lastly, the spec adds official support for Exif data, allowing metadata such as copyright information and camera settings to be embedded directly within the file."
W3C published the Portable Network Graphics (PNG) Specification (Third Edition), the first major update since 2003. The specification adds High Dynamic Range (HDR) support via a new 4-byte cICP chunk that specifies color space, transfer function, and matrix coefficients for accurate rendering on wide-gamut displays. The update formalizes Animated PNGs (APNGs) to provide lossless frame-by-frame animation with 24-bit color and 8-bit alpha as an alternative to animated GIFs. The specification also introduces official Exif metadata support to embed copyright and camera settings. Industry participants including Adobe, Apple, and Google contributed, motivated in part by subtitle HDR needs and archival requirements.
Read at InfoQ
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