JNG (IPA /dʒɪŋ/) is a JPEG-based graphics file format which is closely related to PNG. The name stands for JPEG Network Graphics. Symbols of the International Phonetic Alphabet as used for English. ... A photo of a flower compressed with successively lossier compression ratios from left to right. ... See also Category:Graphics file formats Here is a summary of the most common graphics file formats: Some file formats, e. ... For other uses, see PNG (disambiguation). ...

JNG was created as an adjunct to the MNG animation format, but may be used as a stand-alone format. JNG files embed a 8 bit or 12 bit JPEG datastream in order to store color data, and may embed another datastream (1, 2, 4, 8, 16 bit PNG, or 8 bit JPEG grayscale image) for transparency information. Actually, a JNG may contain two separate JPEG datastreams for color information (one eight-bit and one twelve-bit) to permit decoders that are unable to (or do not wish to) handle twelve-bit datastreams to display the eight-bit datastream instead, if one is present. MNG (pronounced in IPA) is a public file format for animated images. ...

Version 1.0 of the JNG specification was released on January 31, 2001 (initially as part of the MNG specification). Usually, all the applications supporting the MNG file format can handle JNG files, too. E.g., Konqueror has native MNG/JNG support, and MNG/JNG plugins are available for Opera, Internet Explorer, and Mozilla Firefox. The Mozilla Application Suite (and hence Netscape) originally supported MNG/JNG, but native support was removed in Mozilla 1.5a by developers and Mozilla has not supported the format since, despite requests from its users. Safari does not support MNG/JNG.

JNG enhances the capabilities of the JFIF format (the usual JPEG file format), by supporting transparency, two consecutive color streams (one 8 bit and the other 12 bit), and other useful PNG features like color correction, gamma correction, embedded color profiles, PNG style metadata, checksums, etc... Please note (as an important feature of the file format), that the transparency information inside a JNG file (as alpha channel) can be saved either in lossless PNG format, or in lossy JPEG format. This way, users can benefit from the power of JPEG compression while preserving lossless (PNG compressed) transparency information. A photo of a flower compressed with successively higher compression ratios from left to right. ...

The chunk based structure of JNG files is essentially the same as that of PNG files, differing only in the slightly different signature and the use of different chunks.

JNG does not have a registered MIME media type, but image/x-jng can be used. In mathematics and computer science, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... For other uses, see ASCII (disambiguation). ... The C0 and C1 control code sets define control codes for use in text. ... Originally, carriage return was the term for the key, lever, or mechanism on a typewriter that would cause the cylinder on which the paper was held (the carriage) to return to the left side of the paper after a line of text had been typed, and would often move it... In computing, line feed (LF) is a control character indicating that one line should be fed out. ... Substitute character (SUB): A control character that is used in the place of a character that is recognized to be invalid or in error or that cannot be represented on a given device. ... Multipurpose Internet Mail Extensions (MIME) is an Internet Standard for the format of e-mail. ...

External links

• JNG 1.0 specification
• Photoshop Plugin (for Photoshop7.0 or greater)