Victorian Electronic Records Strategy


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Home > Standard > Standard (Version 2) >Specification 4 > Standard Long Term Preservation Formats

3. Standard Long Term Preservation Formats

3.5. JPEG

Usage

Use for continuous tone images (e.g. photos), particularly for images that do not have sharp edges.

Standard

The image must conform to ISO 10918-1:1994, ‘Information Technology – Digital compression and coding of continuous-tone still images: Requirements and guidelines’ or the equivalent ITU-T standard T.81 (Note that ISO 10918-1:1994 includes a lossless mode. There is a separate JPEG standard (ISO 14495-1) which defines another JPEG lossless compression algorithm. ISO 14495-1 images are not accepted by VERS).

Any of the four profiles defined in ISO 10918.1:1994 is accepted.

The encoding of the image must be as defined in Appendix B of ISO 10918-1:1994, except the ‘abbreviated format for compressed image data’ is not accepted. The JFIF file format (http://www.jpeg.org/public/jfif.pdf visited 1 May 2006) is accepted.

Suggested value of File Encoding (M128)

The following text is recommended for inclusion in the File Encoding (M128) element when the Encoding contains a JPEG image encoded using the Appendix B format.

The content of the DocumentData element is a JPEG image. The file conforms to ISO 10918-1:1994, ‘Information Technology – Digital compression and coding of continuous-tone still images: Requirements and guidelines’ (also known as ITU-T T.81). The file has been encoded using Base64, which is defined in IETF RFC 2045 ‘Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies’, Section 6.8 ‘Base64 Content-Transfer-Encoding’.

The following text is recommended for inclusion in the File Encoding (M128) element when the Encoding contains a JPEG/JFIF image.

The content of the DocumentData element is a JPEG image. The file conforms to ISO 10918-1:1994, ‘Information Technology – Digital compression and coding of continuous-tone still images: Requirements and guidelines’ (also known as ITU-T T.81), and the ‘JPEG File Interchange Format’, version 1.02. The file has been encoded using Base64, which is defined in IETF RFC 2045 ‘Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies’, Section 6.8 ‘Base64 Content-Transfer-Encoding’.

The following text is recommended for inclusion in the File Encoding (M128) element when the Encoding contains a JPEG image that may be either encoded using the Appendix B format or JFIF format.

The content of the DocumentData element is a JPEG image. The file conforms to ISO 10918-1:1994, ‘Information Technology – Digital compression and coding of continuous-tone still images: Requirements and guidelines’ (also known as ITU-T T.81), and may also conform to ‘JPEG File Interchange Format’, version 1.02. The file has been encoded using Base64, which is defined in IETF RFC 2045 ‘Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies’, Section 6.8 ‘Base64 Content-Transfer-Encoding’.

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