Provided by: xscreensaver-data-extra_4.23-4ubuntu8_i386
vidwhacker - grab images and apply random filters to them
vidwhacker [-display host:display.screen] [-root] [-verbose] [-stdin]
[-stdout] [-delay seconds] [-directory directory]
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.
-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
How long to sleep between images. Default 5 seconds (the
actual elapsed time is significantly longer, due to processing
-stdout Instead of displaying the image on a window or on the root,
write the new image on stdout, and exit.
Use this directory instead of the imageDirectory specified in
the ~/.xscreensaver file.
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 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 available.
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
Jamie Zawinski <email@example.com>, 18-Jan-98.