1vidwhacker(6x)                XScreenSaver manual               vidwhacker(6x)
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NAME

6       vidwhacker - grab images and apply random filters to them
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SYNOPSIS

9       vidwhacker  [--display  host:display.screen] [--root] [--window-id num‐
10       ber][--verbose] [--stdin] [--stdout] [--delay seconds] [-directory  di‐
11       rectory] [--fps]
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DESCRIPTION

14       Distorts  an  image  using  a random series of filters: edge detection,
15       subtracting the image from a rotated version of itself, etc.
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17       Selection of random  image  files  is  done  by  running  the  xscreen‐
18       saver-getimage-file(6x)  program.   Capture  of  video  frames  (if re‐
19       quested) is done by running  the  xscreensaver-getimage-video(6x)  pro‐
20       gram.
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OPTIONS

23       vidwhacker accepts the following options:
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25       --root  Draw on the root window.  This is the default.
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27       --window-id number
28               Draw on the specified window.
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30       --verbose
31               Print diagnostics.
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33       --stdin Instead  of grabbing an image from disk or video, read an image
34               to manipulate from stdin.  This image must be in ppm(5) format.
35               The  program will still perform repeated random image transfor‐
36               mations, but it will always use this one image as its  starting
37               point.
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39       --delay seconds
40               How  long  to sleep between images.  Default 5 seconds (the ac‐
41               tual elapsed time is significantly longer,  due  to  processing
42               time.)
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44       --stdout
45               Instead  of  displaying  the  image on a window or on the root,
46               write the new image on stdout, and exit.
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48       --directory directory
49               Use this directory instead of the imageDirectory  specified  in
50               the ~/.xscreensaver file.
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52       --fps   Display the current frame rate and CPU load.
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ENVIRONMENT

55       DISPLAY to get the default host and display number.
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57       XENVIRONMENT
58               to  get  the  name of a resource file that overrides the global
59               resources stored in the RESOURCE_MANAGER property.
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61       XSCREENSAVER_WINDOW
62               The window ID to use with --root.
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BUGS

65       It is poorly named; originally it worked only on grabbed video  frames,
66       before being expanded to work on any image.
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68       It  requires  the  various PBM tools, e.g., ppmrelief(1).  Though still
69       available, the "pbmplus" suite has largely fallen out  of  favor  these
70       days,  so  it would be nice if someone were to port this script to make
71       use of ImageMagick's convert(1) instead.  That would also probably make
72       it faster.
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SEE ALSO

75       X(1),  xscreensaver(1),  xscreensaver-getimage(6x), xscreensaver-getim‐
76       age-file(6x), xscreensaver-getimage-video(6x), ppmtogif(1), convert(1)
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79       Copyright © 1998-2001 by Jamie Zawinski.  Permission to use, copy, mod‐
80       ify,  distribute,  and sell this software and its documentation for any
81       purpose is hereby granted without fee, provided that  the  above  copy‐
82       right  notice  appear in all copies and that both that copyright notice
83       and this permission notice appear in supporting documentation.  No rep‐
84       resentations  are  made  about the suitability of this software for any
85       purpose.  It is provided "as is" without express or implied warranty.
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AUTHOR

88       Jamie Zawinski <jwz@jwz.org>, 18-Jan-98.
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92X Version 11               6.08-1.fc39 (17-Oct-2023)            vidwhacker(6x)
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