NAME

tessellimage - Converts an image to triangles using Delaunay tessellation.

SYNOPSIS

tessellimage [-display host:display.screen] [-visual visual] [-window] [-root] [-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.

-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.

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.