NAME

       tessellimage - Converts an image to triangles using Delaunay tessellation.

SYNOPSIS

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

DESCRIPTION

       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.

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.

       --window-id number
               Draw on the specified 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.

       --max-resolution pixels
               The size of the loaded image will be constrained to this width or height, to reduce the number of
               pixels examined.  Think of it as an initial low-pass filter.  Default 1024.

       --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.

       XSCREENSAVER_WINDOW
               The window ID to use with --root.

SEE ALSO

       X(1), xscreensaver(1)

COPYRIGHT

       Copyright © 2014-2018 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.