vfeedback(6) XScreenSaver manual vfeedback(6)

NAME

vfeedback - Simulates video feedback.

SYNOPSIS

vfeedback [--display host:display.screen] [--visual visual]
[--window] [--root] [--window-id number] [--tv-color number] [--tv-
tint number] [--noise number] [--tv-brightness number] [--tv-contrast
number] [--fps]

DESCRIPTION

Simulates video feedback: pointing a video camera at an NTSC
television.

OPTIONS

--visual visual
Specify which visual to use. Legal values are the name of a
visual class, or the id number (decimal or hex) of a specific
visual.

--window
Draw on a newly-created window. This is the default.

--root Draw on the root window.

--window-id number
Draw on the specified window.

--tv-color number
Color Knob. 0 - 1000. Default: 70.

--tv-tint number
Tint Knob. 0 - 100. Default: 5.

--noise number
Analog noise. 0.0 - 0.2. Default: 0.02.

--darken number
Darken the looped image. 0.0 - 1.0. Default: 0.7.

--tv-brightness number
Brightness Knob. 0.0 - 100.0. Default: 3.0.

--tv-contrast number
Contrast Knob. 0 - 1500. Default: 1000.

--fps | --no-fps
Whether to show a frames-per-second display at the bottom of
the screen.

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.

XSCREENSAVER_WINDOW
The window ID to use with --root.

SEE ALSO

X(1), xscreensaver(1)

COPYRIGHT

Copyright (C) 2018 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.

AUTHOR

Jamie Zawinski.

X Version 11 6.09 (07-Jun-2024) vfeedback(6)