vfeedback − Simulates video feedback.
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]
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.
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−−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.
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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.
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.