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Portable Network Graphics (PNG) Specification (Third Edition)
https://www.w3.org/TR/2022/WD-png-3-20221025/#F-ChageList
APNG と EXIF が規格入りするのか
www.w3.orgPortable Network Graphics (PNG) Specification (Third Edition)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.