Provided by: xscreensaver-data-extra_5.45+dfsg1-2ubuntu1_amd64 bug

NAME
       vfeedback - Simulates video feedback.


SYNOPSIS
       vfeedback  [-display host:display.screen] [-visual visual] [-window] [-root] [-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.

       -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.


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.

X Version 11                                   5.45 (08-Dec-2020)                                  vfeedback(6x)