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       tessellimage - Converts an image to triangles using Delaunay tessellation.


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


       Converts  an  image  to  triangles using Delaunay tessellation, and animates the result at
       various depths. More triangles are allocated to visually complex parts of the image.  This
       is accomplished by first computing 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 threshold: those are the pixels that
       have the largest change in color/brightness.


       -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 seconds).

       -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.


       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 © 2014 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.