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tessellimage - Man Page

Converts an image to triangles using Delaunay tessellation.


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]


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.

--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.



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.


The window ID to use with --root.

See Also

X(1), xscreensaver(1)


Jamie Zawinski.


6.09-1.fc41 (11-Jun-2024) X Version 11 XScreenSaver manual