XWD Files

These are some examples of XWD files, which are X window "dump" files.

XWD File Characteristics:

• binary
• color
• 2D
• No compression
• 1 image

Reference:

1. Valerie Quercia, Tim OReilly,
   X Window System User's Guide,
   Volume Three,
   O'Reilly, 1990.

Programs to create an XWD file include:

• The X Window command xwd -out filename, followed by the selection of a particular X window (just click in it!), will create an XWD file.

Programs and routines to read an XWD file:

• MATLAB can read an XWD file with a command like A=imread('file.xwd','XWD').

Programs and routines to write an XWD file:

• MATLAB can write an XWD file with commands like

  
              IM(:,:,1) = red data;
              IM(:,:,2) = green data;
              IM(:,:,3) = blue data;
              imwrite ( IM, 'file.xwd', 'XWD' )
            

  .

  
              [ X, map ] = capture ( figure_handle );
              imwrite ( X, map, 'file.xwd', 'XWD' )
            

  .

Programs to view an XWD file:

• GIMP, the GNU Image Manipulation Program, can read in an XWD file and display it.
• MATLAB can display an XWD file, once it is read in, with a command like image(A).
• The program xv can display an XWD file, and then save it in a variety of other formats.
• The xwud command is a special X Window "undumping" command which will display an XWD file.

Programs to convert an XWD file to another format:

• The ImageMagick, program convert can convert an XWD file to BMP, CGM, EPS, FIG, FITS, GIF, JPG, PBM, PDF, PGM, PNG, PNM, PPM, PS, RGB, TIF or XBM format.
• The NETPBM program xwdtopnm converts an XWD file to a PNM file.
• GIMP, The GNU Image Manipulation Program, can read in an XWD file, and write it out in a variety of formats.

Programs to convert a file to XWD format:

• GIMP, The GNU Image Manipulation Program, can read in a file in a variety of formats, and save a version of it as an XWD file.

Sample Files:

BRAIN is an image of a brain.

• brain.xwd, an image of a brain;
• brain.png, is a PNG image of a brain;

GASKET_POLY_FILLED is an image of the Sierpinski gasket.

• gasket_poly_filled.xwd, an image of a brain;
• gasket_poly_filled.png, is a PNG image of a brain;

POLYFISH is a model of a fish.

• polyfish.xwd, an image of a fish;
• polyfish.png, is a PNG image of a fish;

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