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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.So you have just bought a new personal computer for your home (rather than for a workplace or as a server) and want to secure it (including protecting it from viruses and spyware).Privacy (including encryption, cryptography and anonymity) is a part of security but broad enough to need covering separately. Making backups of data, defragging, system restore points are only indirectly related.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).

A PNG file consists of the PNG Signature (8 special bytes), followed by a series of chunks.

and MNG support was never included in Google Chrome, Internet Explorer, Opera, or Safari.

The GIF file format has better application and browser support than APNG, but it is limited to 256 colors per frame and supports only index transparency, by mapping one of the palette colors to transparent.

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.

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