1tessellimage(6x)              XScreenSaver manual             tessellimage(6x)
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NAME

6       tessellimage  - Converts an image to triangles using Delaunay tessella‐
7       tion.
8

SYNOPSIS

10       tessellimage [-display host:display.screen] [-visual visual]  [-window]
11       [-root]  [-delay  number] [-duration number] [-duration2 number] [-max-
12       depth number] [-max-resolution pixels] [-no-outline]  [-no-fill-screen]
13       [-fps]
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DESCRIPTION

16       Converts  an  image  to triangles using Delaunay tessellation, and ani‐
17       mates the result at various depths. More  triangles  are  allocated  to
18       visually complex parts of the image. This is accomplished by first com‐
19       puting the first derivative of the image:  the  distance  between  each
20       pixel and its neighbors. Then the Delaunay control points are chosen by
21       selecting those pixels whose distance value is above a certain  thresh‐
22       old: those are the pixels that have the largest change in color/bright‐
23       ness.
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OPTIONS

26       -visual visual
27               Specify which visual to use.  Legal values are the  name  of  a
28               visual  class,  or the id number (decimal or hex) of a specific
29               visual.
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31       -window Draw on a newly-created window.  This is the default.
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33       -root   Draw on the root window.
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35       -delay number
36               Per-frame delay, in microseconds.  Default:  30000  (0.03  sec‐
37               onds).
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39       -duration number
40               Length of time until loading a new image. Default: 2 minutes.
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42       -duration2 number
43               Length of time until increasing or decreasing the triangulation
44               depth.  Default: 0.4 seconds.
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46       -max-depth number
47               The maximum number of triangles to render.  Default: 40000.
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49       -max-resolution pixels
50               The size of the loaded image will be constrained to this  width
51               or  height,  to reduce the number of pixels examined.  Think of
52               it as an initial low-pass filter.  Default 1024.
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54       -outline | -no-outline
55               Whether to outline the triangles.
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57       -fill-screen | -no-fill-screen
58               Whether to zoom in on the image to completely fill the  screen,
59               or to center it.
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61       -fps | -no-fps
62               Whether  to  show  a frames-per-second display at the bottom of
63               the screen.
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ENVIRONMENT

66       DISPLAY to get the default host and display number.
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68       XENVIRONMENT
69               to get the name of a resource file that  overrides  the  global
70               resources stored in the RESOURCE_MANAGER property.
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SEE ALSO

73       X(1), xscreensaver(1)
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76       Copyright © 2014-2018 by Jamie Zawinski.  Permission to use, copy, mod‐
77       ify, distribute, and sell this software and its documentation  for  any
78       purpose  is  hereby  granted without fee, provided that the above copy‐
79       right notice appear in all copies and that both that  copyright  notice
80       and this permission notice appear in supporting documentation.  No rep‐
81       resentations are made about the suitability of this  software  for  any
82       purpose.  It is provided "as is" without express or implied warranty.
83

AUTHOR

85       Jamie Zawinski.
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89X Version 11               6.02-4.fc35 (09-Nov-2021)          tessellimage(6x)
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