(registered 2019-09-03, last updated 2019-09-03) Media type name: image Media subtype name: jxs Required parameters: none Optional parameters: none Encoding considerations: binary Files are binary and should be transmitted in a suitable encoding without CR/LF conversion, 7-bit stripping etc.; base64 is a suitable encoding. Security considerations: The conveyed coded image files defined in Annex A of ISO/IEC 21122-3 use a structure that can store image data, metadata corresponding to this image data, and other user-defined data. The data files have an extensible structure, so that it is theoretically possible that metadata fields could be defined in the future that could be used to induce particular actions on the part of the recipient, thus presenting additional security risks, but this type of capability is not supported in the current referenced specifications. Interoperability considerations: JPEG XS coded image files can conform to one of several profiles and levels of capabilities (as specified in ISO/IEC 21122-2) – not all of which may be supported by a receiving decoder. As a result, implementations may attempt to decode and display an encoded JPEG XS image only to determine that the image cannot be rendered either partially or in full. Published specifications: ISO/IEC 21122-3, Information technology – JPEG XS low-latency lightweight image coding system - Part 3: Transport and container formats Applications: Multimedia, Imaging, Pictures, Scientific Fragment identifier considerations: None Restrictions on usage: None Additional information: Deprecated alias names for this type: N/A Magic number(s): Starts with 12-byte string 0x0000 000C 4A58 5320 0D0A 870A as specified in ISO/IEC 21122-3. File extension(s): jxs Macintosh File Type Code(s): N/A Object Identifiers: N/A Intended usage: Common Contact name: ISO/IEC JTC 1/SC 29/WG 1 Convenor Contact email address: sc29-sec&itscj.ipsj.or.jp Author/Change controller: ISO/IEC JTC1 SC29 WG1 Other general information: It should be noted that selected metadata fields may encompass information partly intended to protect the image against unauthorized use or distribution. In this case, the intention may be that alteration or removal of the data in the fields would be treated as an offence. Metadata fields may also contain information about the source of the image content.