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 © 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.