Editing Multiple-image Network Graphics (section)

{{short description|File format}}
{{Use dmy dates|date=July 2021}}

{{Infobox file format
| name =           Multiple-image Network Graphics
| extension =      .mng
| mime =           video/x-mng (unofficial)
| owner = PNG Development Group (donated to [[World Wide Web Consortium|W3C]])

| creatorcode = 
| genre =          [[computer animation]] 
| container for =  [[Portable Network Graphics|PNG]], [[JPEG Network Graphics|JNG]]
| extended from =  [[Portable Network Graphics|PNG]]
}}

'''Multiple-image Network Graphics''' ('''MNG''') is a [[graphics file format]] published in 2001 for [[computer animation|animated]] images. Its specification is publicly documented and there are [[free software]] reference implementations available.

MNG is closely related to the [[Portable Network Graphics|PNG]] image format. When PNG development started in early 1995, developers decided not to incorporate support for [[animation]], because the majority of the PNG developers felt that overloading a single file type with both still and animation features is a bad design, both for users (who have no simple way of determining to which class a given image file belongs) and for web servers (which should use a MIME type starting with <code>image/</code> for stills and <code>video/</code> for animations—GIF notwithstanding),<ref>{{Cite web|url=http://www.libpng.org/pub/png/pngfaq.html#animation|title=PNG Frequently Asked Questions|website=libpng.org}}</ref> but work soon started on MNG as an animation-supporting version of PNG. Version 1.0 of the MNG specification was released on 31 January 2001.