Format
Computer Graphics Metafile ASCII
Summary
- Name
- Computer Graphics Metafile ASCII
- Version
- 1
- Identifiers
-
- MIME: image/cgm
- PUID: x-fmt/142
- Format type
-
- Image (Raster)
- Image (Vector)
- Text (Structured)
- Description
- Computer Graphics Metafile (CGM) is a standardized platform-independent format used for the interchange of raster and vector data. CGM was developed under the auspices of the International Standards Organization (ISO) and the American Standards National Institute (ANSI). It is also used in conjunction with a variety of input and output devices. Although CGM incorporates extensions designed to support raster data storage, files in CGM format are used primarily to store vector information. CGM files typically contain either bitmap or vector data, but rarely both. It uses Clear Text Encoding. File format specifications available at http://standards.iso.org/ittf/PubliclyAvailableStandards/c044114_ISO_IEC_8632-1_1999_Cor_1_2006%28E%29.pdf
- File extensions
-
cgm - Source
- Digital Preservation Department / The National Archives
Internal signatures
Computer Graphics Metafile (Clear Text) Version 1 No.1
- Note
- Element name begmf (Begin Metafile) with any letter in the element name in upper or lower case, followed by any number of bytes, followed by version (MFVERSION{1}1 or mfversion{1}1, or any upper/lower case combination). Trailer endmf{0-1}; (with any letter in the element name in upper or lower case) that can be followed by a comment
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
42(45|65)(47|67)(4D|6D)(46|66)*(4D|6D)(46|66)(56|76)(65|45)(52|72)(53|73)(49|69)(4F|6F)(4E|6E){1}31- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- 2048
- Byte Sequence
45(4E|6E)(44|64)(4D|6D)(46|66){0-1}3B- Endianness
- None
Computer Graphics Metafile (Clear Text) Version 1 No.2
- Note
- Element name begmf (Begin Metafile) with any letter in the element name in upper or lower case, followed by any number of bytes, followed by version (MFVERSION{1}1 or mfversion{1}1, or any upper/lower case combination). Trailer endmf{0-1}; (with any letter in the element name in upper or lower case) that can be followed by a comment
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
42(45|65)(47|67)(4D|6D)(46|66)*(4D|6D)(46|66)(56|76)(65|45)(52|72)(53|73)(49|69)(4F|6F)(4E|6E){1}31- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- 2048
- Byte Sequence
65(4E|6E)(44|64)(4D|6D)(46|66){0-1}3B- Endianness
- None
Computer Graphics Metafile (Clear Text) Version 1 No.3
- Note
- Element name begmf (Begin Metafile) with any letter in the element name in upper or lower case, followed by any number of bytes, followed by version (MFVERSION{1}1 or mfversion{1}1, or any upper/lower case combination). Trailer endmf{0-1}; (with any letter in the element name in upper or lower case) that can be followed by a comment
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
62(45|65)(47|67)(4D|6D)(46|66)*(4D|6D)(46|66)(56|76)(65|45)(52|72)(53|73)(49|69)(4F|6F)(4E|6E){1}31- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- 2048
- Byte Sequence
45(4E|6E)(44|64)(4D|6D)(46|66){0-1}3B- Endianness
- None
Computer Graphics Metafile (Clear Text) Version 1 No.4
- Note
- Element name begmf (Begin Metafile) with any letter in the element name in upper or lower case, followed by any number of bytes, followed by version (MFVERSION{1}1 or mfversion{1}1, or any upper/lower case combination). Trailer endmf{0-1}; (with any letter in the element name in upper or lower case) that can be followed by a comment
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
62(45|65)(47|67)(4D|6D)(46|66)*(4D|6D)(46|66)(56|76)(65|45)(52|72)(53|73)(49|69)(4F|6F)(4E|6E){1}31- Endianness
- None
- Min Frag Length
- Absolute from EOF
- Offset
- 0
- Max offset
- 2048
- Byte Sequence
65(4E|6E)(44|64)(4D|6D)(46|66){0-1}3B- Endianness
- None
Changelog
-
Updated in V55
- Release date
- 4 January 2012
Computer Graphics Metafile ASCII 1: Format description information supplied by NARA Information Services/Applied Research Division, The National Archives and Records Administration.
-
Added in V45
- Release date
- 6 December 2010
Computer Graphics Metafile ASCII 1.: Record title updated to distinguish different versions.
Computer Graphics Metafile ASCII 1: Signature submitted by Georgia Tech Research Institute, USA.