Format

Portable Bitmap Image - ASCII

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Summary

Name

Portable Bitmap Image - ASCII

Identifiers

MIME: image/x-portable-bitmap
PUID: x-fmt/164

Format type

Image (Raster)

Description

This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select ‘Add an Entry’.

Format encoding

Text

File extensions

pbm

Submitted by

Digital Preservation Department / The National Archives

Internal signatures

Portable Bitmap Image - ASCII

Description: “P1” followed by a whitespace char (blank, TAB, CR, LF).
Provenance: PBM. User Manual for Netpbm http://netpbm.sourceforge.net/doc/pbm.html

Byte sequences

Min Frag Length: Absolute from BOF
Offset: 0
Max offset: None
Byte Sequence: 5031(20|09|0D0A|0A)
Endianness: None

Min Frag Length: Absolute from EOF
Offset: 0
Max offset: 70
Byte Sequence: (30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)(30|31|20|0A|0D)0A
Endianness: None

Changelog

V58

Release date

21 March 2012
- Added signature
  
  Portable Bitmap Image - ASCII: Signature submitted by Georgia Tech Research Institute, USA.
- Updated
  
  Portable Bit Map Image - ASCII: Format name changed for greater accuracy and consistency.