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tessellimage(6)		      XScreenSaver manual	       tessellimage(6)

NAME
       tessellimage  - Converts an image to triangles using Delaunay tessella‐
       tion.

SYNOPSIS
       tessellimage [-display host:display.screen] [-visual visual]  [-window]
       [-root]	[-delay	 number] [-duration number] [-duration2 number] [-max-
       depth number] [-no-outline] [-no-fill-screen] [-fps]

DESCRIPTION
       Converts an image to triangles using Delaunay  tessellation,  and  ani‐
       mates  the  result  at  various depths. More triangles are allocated to
       visually complex parts of the image. This is accomplished by first com‐
       puting  the  first  derivative  of the image: the distance between each
       pixel and its neighbors. Then the Delaunay control points are chosen by
       selecting  those pixels whose distance value is above a certain thresh‐
       old: those are the pixels that have the largest change in color/bright‐
       ness.

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.

       -delay number
	       Per-frame  delay,  in  microseconds.  Default: 30000 (0.03 sec‐
	       onds).

       -duration number
	       Length of time until loading a new image. Default: 2 minutes.

       -duration2 number
	       Length of time until increasing or decreasing the triangulation
	       depth.  Default: 0.4 seconds.

       -max-depth number
	       The maximum number of triangles to render.  Default: 40000.

       -outline | -no-outline
	       Whether to outline the triangles.

       -fill-screen | -no-fill-screen
	       Whether	to zoom in on the image to completely fill the screen,
	       or to center it.

       -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 © 2014 by Jamie Zawinski.  Permission to use,	copy,  modify,
       distribute,  and	 sell this software and its documentation for any pur‐
       pose 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	repre‐
       sentations are made about the suitability of this software for any pur‐
       pose.  It is provided "as is" without express or implied warranty.

AUTHOR
       Jamie Zawinski.

X Version 11		      5.34 (24-Oct-2015)	       tessellimage(6)

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