Multiple-image Network Graphics is a public graphics file format for animated images.
MNG is closely related to the 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 the image/foo MIME type for stills and video/foo for animations--GIF notwithstanding). However, 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.
Read more about Multiple-image Network Graphics: Technical Details, Alternatives
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