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.