Provided by: xscreensaver-data-extra_5.42+dfsg1-1ubuntu1_amd64 bug


       vfeedback - Simulates video feedback.


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


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


       -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.


       DISPLAY to get the default host and display number.

               to get the name of a resource file that overrides the global resources  stored  in
               the RESOURCE_MANAGER property.


       X(1), xscreensaver(1)


       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.


       Jamie Zawinski.