The Animated Portable Network Graphics (APNG) file format is an extension to the Portable Network Graphics (PNG) specification. It allows for animated PNG files that work similarly to animated GIF files, while supporting 24-bit images and 8-bit transparency not available for GIFs. It also retains backward compatibility with non-animated PNG files.
The first frame of an APNG file is stored as a normal PNG stream, so most standard PNG decoders are able to display the first frame of an APNG file. The frame speed data and extra animation frames are stored in extra chunks (as provided for by the original PNG specification).
APNG competes with Multiple-image Network Graphics (MNG), a comprehensive format for bitmapped animations created by the same team as PNG. APNG's advantage is the smaller library size and compatibility with older PNG implementations.
references:
https://en.wikipedia.org/wiki/APNG
The first frame of an APNG file is stored as a normal PNG stream, so most standard PNG decoders are able to display the first frame of an APNG file. The frame speed data and extra animation frames are stored in extra chunks (as provided for by the original PNG specification).
APNG competes with Multiple-image Network Graphics (MNG), a comprehensive format for bitmapped animations created by the same team as PNG. APNG's advantage is the smaller library size and compatibility with older PNG implementations.
Mozilla's role in extending the PNG format to APNG echoes Netscape's much earlier role in popularizing animated GIFs.[citation needed]
In 2016, Apple adopted the APNG format as the preferred format for animated stickers in iOS 10 iMessage apps.[10]
On March 15, 2017 APNG support was added to Chromium.[11] This leaves Microsoft Edge's EdgeHTML rendering engine as the only engine to not support the format.
references:
https://en.wikipedia.org/wiki/APNG
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