tessellimage - Converts an image to triangles using Delaunay tessellation.

       Jamie Zawinski.

X Version 11                                   6.08 (10-Oct-2023)                               tessellimage(6x)

       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.

       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.

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.

       tessellimage - Converts an image to triangles using Delaunay tessellation.

--visualvisual
               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-idnumber
               Draw on the specified window.

       --delaynumber
               Per-frame delay, in microseconds.  Default: 30000 (0.03 seconds).

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

       --duration2number
               Length of time until increasing or decreasing the triangulation depth.  Default: 0.4 seconds.

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

       --max-resolutionpixels
               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.

X(1), xscreensaver(1)

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]