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In 2008, certain Mozilla developers published the Animated Portable Network Graphics (APNG) format with similar goals.APNG is a format that is natively supported by Gecko- and Presto-based web browsers and is also commonly used for thumbnails on Sony's Play Station Portable system (using the normal PNG file extension), and as of 2017, usage of APNG remains minimal despite being supported by all major browsers but Microsoft Edge.The original authors listed on RFC 2083 are: After the header comes a series of chunks, each of which conveys certain information about the image.Chunks declare themselves as critical or ancillary, and a program encountering an ancillary chunk that it does not understand can safely ignore it.The CRC is a network-byte-order CRC-32 computed over the chunk type and chunk data, but not the length.Chunk types are given a four-letter case sensitive ASCII type/name; compare Four CC.The motivation for creating the PNG format was the realization, in early 1995, that the Lempel–Ziv–Welch (LZW) data compression algorithm used in the Graphics Interchange Format (GIF) format was patented by Unisys.There were also other problems with the GIF format that made a replacement desirable, notably its limit of 256 colors at a time when computers able to display far more than 256 colors were becoming common.
The case of the fourth letter indicates whether the chunk is safe to copy by editors that do not recognize it.
The original PNG specification was authored by an ad-hoc group of computer graphics experts and enthusiasts.
Discussions and decisions about the format were conducted by email.
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