Provided by: xscreensaver-data-extra_5.34-2ubuntu1_amd64 bug


       vidwhacker - grab images and apply random filters to them


       vidwhacker  [-display  host:display.screen]  [-root] [-verbose] [-stdin] [-stdout] [-delay
       seconds] [-directory directory] [-fps]


       The vidwhacker program grabs an image from disk, or  from the system's video  input,  then
       applies  random image filters to it, and displays the result.  The vidwhacker program does
       not terminate until killed.

       It depends heavily on the various PBM tools (e.g., ppmrelief(1).)

       Selection of random image files  is  done  by  running  the  xscreensaver-getimage-file(1)
       program.   Capture  of  video  frames  (if requested) is done by running the xscreensaver-
       getimage-video(1) program.  The options of whether to do video,  and  which  directory  to
       search for images, are specified in the ~/.xscreensaver file.


       vidwhacker accepts the following options:

       -root   Draw on the root window.  This is the default.

               Print diagnostics.

       -stdin  Instead  of grabbing an image from disk or video, read an image to manipulate from
               stdin.  This image must be in ppm(5)  format.   The  program  will  still  perform
               repeated  random  image  transformations, but it will always use this one image as
               its starting point.

       -delay seconds
               How long to sleep between images.  Default 5 seconds (the actual elapsed  time  is
               significantly longer, due to processing time.)

       -stdout Instead of displaying the image on a window or on the root, write the new image on
               stdout, and exit.

       -directory directory
               Use this directory instead of the imageDirectory specified in the  ~/.xscreensaver

       -fps    Display the current frame rate and CPU load.


       DISPLAY to get the default host and display number.

               to  get  the name of a resource file that overrides the global resources stored in
               the RESOURCE_MANAGER property.


       It's slow.


       It might be interesting to rewrite this to use gimp(1) plugins instead of the  pbm  tools.
       It  probably  wouldn't  be  any  faster,  but  there  would  be a wider variety of effects


       X(1),  xscreensaver(1),   xscreensaver-getimage-file(1),   xscreensaver-getimage-video(1),
       xv(1), ppmtogif(1), cjpeg(1)


       Copyright © 1998-2001 by Jamie Zawinski.  Permission to use, copy, modify, distribute, and
       sell this software and its documentation for any purpose is hereby  granted  without  fee,
       provided that the above copyright notice appear in all copies and that both that copyright
       notice and this permission notice appear in supporting documentation.  No  representations
       are  made  about the suitability of this software for any purpose.  It is provided "as is"
       without express or implied warranty.


       Jamie Zawinski <>, 18-Jan-98.