Format
Windows Bitmap
Summary
- Name
- Windows Bitmap
- Version
- 2.0
- Identifiers
-
- Apple Uniform Type Identifier: com.microsoft.bmp
- PUID: fmt/115
- MIME: image/bmp
- 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’. Windows bitmap 2.0 and OS/2 bitmap 1.0 are effectively the same format - the only difference is the data type of the width and height fields of the bitmap header – for Windows 2.0 bitmaps they are signed short integers, for OS/2 1.0 bitmaps they are unsigned shorts. For positive numbers the representation is the same. Consequently, the file formats cannot be distinguished with a file signature test. The PUID for OS/2 Bitmap 1.0 (x-fmt/25) has therefore been deprecated.
- File extensions
-
bmp,dib - Source
- Digital Preservation Department / The National Archives
Relationships
- Equivalent to
- Is previous version of
- Is subsequent version of
Internal signatures
Windows Bitmap 2.0
- Note
- BITMAPFILEHEADER: File Type identifier “BM”, file size (4 butes); two short integer reserved fields with values zero, long integer offset to bitmap image data + BITMAPINFOHEADER: length of bitmap header, long integer 12; number of color planes, short integer, always 1; number of bits per pixel, short integer, 1, 4, 8 or 24.
Byte sequences
- Min Frag Length
- Absolute from BOF
- Offset
- 0
- Max offset
- None
- Byte Sequence
424D{4}00000000{4}0C000000{4}0100(01|04|08|18)00- Endianness
- None
Changelog
-
Updated in V51
- Release date
- 15 July 2011
Windows Bitmap 2.0: Existing signature refined by Georgia Tech Research Institute, USA.