Section: XScreenSaver manual (6)
Updated: 5.40 (12-Aug-2018)
tessellimage - Converts an image to triangles using Delaunay tessellation.
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.
Draw on a newly-created window. This is the default.
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.
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.
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.