Format

X-Windows Screen Dump

Summary

Name: X-Windows Screen Dump
Version: X11
Identifiers: PUID: fmt/401
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’.
File extensions: xwd, xdm
Submitted by: Georgia Tech Research Institute / Georgia Tech Research Institute

Description: Header starts with 4-byte integers: Length (100 [+ filename length]); Version (7); Format (0 - 1-bit XYBitmap, 1 - single-plane XYPixmap, 2 - multi-plane Zpixmap); Depth (1-32); Width; Height; XOffset; Byte Order (0 - least significant byte first, 1 - most significant byte first); Unit Size (8,16,32); Bit Order (0 - least significant bit first, 1 - most significant bit first); Padding Bits (8,16,32); Bits Per Pixel (1-16,24,32); Bytes Per Line; Class (0 - static grey, 1 - grey scale, 2 - static colour, 3 - pseudocolour, 4 - true colour, 5 - direct colour).
Provenance: XWD - X Window Dump www.martinreddy.net/gfx/2d/XWD.txt XWD File Format Summary. Encyclopedia of Graphics File Formats. O’Reilly. Www.fileformat.info/format/xwd/egff.htm

Min Frag Length: Absolute from BOF
Offset: 0
Max offset: None
Byte Sequence: 000000??00000007000000(00|01|02)000000[01:20]{12}000000(00|01)000000(08|10|20)000000(00|01)000000(08|10|20)000000(01|02|03|04|05|06|07|08|09|0A|0B|0C|0D|0E|0F|10|18|20){4}000000[00:05]
Endianness: Big-endian