vidwhacker man page on DigitalUNIX
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XScreenSaver(1) XScreenSaver(1)
NAME
vidwhacker - grab images and apply random filters to them
SYNOPSIS
vidwhacker [-display host:display.screen] [-root] [-window] [-verbose]
[-stdin] [-stdout] [-delay seconds]
DESCRIPTION
The vidwhacker program grabs a image from the system's video input,
applies random image filters to it, and displays the result. The vid‐
whacker program does not terminate until killed. It depends heavily on
xv(1) and the various PBM tools (e.g., ppmrelief(1).)
OPTIONS
vidwhacker accepts the following options:
-root Draw on the root window.
-window Pop up a new window displaying the image. When a new image has
been fully processed, destroy that window and pop up a new one.
This is the default.
-verbose
Print diagnostics.
-stdin Instead of grabbing an image from the system's video input,
read an image to maniupulate from stdin. This image must be in
-delay seconds
How long to sleep between images. Default 3 seconds (the
actual elapsed time is significantly longer, due to processing
time.) ppm(5) format. The program will still perform repeated
random image transformations, but it will always use this one
image as its starting point.
-stdout Instead of displaying the image on a window or on the root,
write the new image on stdout, and exit.
ENVIRONMENT
DISPLAY to get the default host and display number.
XENVIRONMENT
to get the name of a resource file that overrides the global
resources stored in the RESOURCE_MANAGER property.
BUGS
Grabbing video images is, of course, very system-dependent. It works
on SGIs, and on Linux systems that have the qcam(1) program. If your
system does things differently, you'll need to edit the vidwhacker
script (look for the grab() function.)
It's slow.
TO DO
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.
SEE ALSO
X(1), xscreensaver(1), xv(1), ppmtogif(1), cjpeg(1)
COPYRIGHT
Copyright © 1998, 1999 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 war‐
ranty.
AUTHOR
Jamie Zawinski <jwz@jwz.org>, 18-Jan-98.
X Version 11 17-Jun-99 XScreenSaver(1)
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