| • Science | • People | • Locations | • Timeline |
The name stands for Multiple-image Network Graphics.
MNG is closely related to the PNG image format. When PNG development started in early 1995, developers decided not to incorporate support for animation, not least of all because this feature of GIF was little used at the time. 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. MNG is currently not as widely supported as PNG. Nonetheless, Netscape and Konqueror have native MNG support, and MNG plugins are available for Opera and Internet Explorer. Mozilla originally supported MNG, but native support for MNG was removed in version 1.5a and Mozilla has not supported the format since. Safari does not support MNG.
The MNG developers hope that in time MNG will begin to replace GIF for animated images on the World Wide Web, just as PNG has already begun to do for still images.
The structure of MNG files is essentially the same as that of PNG files, differing only in the slightly different signature (8A 4D 4E 47 0D 0A 1A 0A in hexadecimal) and the use of a much greater variety of chunks to support all the animation features that it provides. Images to be used in the animation are stored in the MNG file as encapsulated PNG or JNGJNG (pronounced jing is a JPEG-based graphics file format, closely related to PNG. The name stands for JPEG Network Graphics''. Unlike JFIF (the usual JPEG file format), JNG supports transparency. JNG was created as an adjunct to the MNG animation format images.
Two versions of MNG of reduced complexity are also defined: MNG-LC (low complexity) and MNG-VLC (very low complexity). These allow applications to include some level of MNG support without having to implement the entire MNG specification.
MNG does not yet have a registered MIMEMultipurpose Internet Mail Extensions MIME is an Internet Standard for the format of e-mail. Virtually all Internet e-mail is transmitted via SMTP in MIME format. Internet e-mail is so closely associated with the SMTP and MIME standards that it is sometim media type, but video/x-mng can be used.
APNGThe APNG Animated Portable Network Graphics file format is a proposed extension to the portable network graphics ( PNG) specification that would allow for animated PNG files that work in a similar fashion to animated graphics interchange format ( GIF) fil is proposed as an alternative to MNG.