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

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

10       tessellimage [--display host:display.screen] [--visual visual]  [--win‐
11       dow] [--root] [--window-id number] [--delay number] [--duration number]
12       [--duration2 number]  [--max-depth  number]  [--max-resolution  pixels]
13       [--no-outline] [--no-fill-screen] [--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
32               Draw on a newly-created window.  This is the default.
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34       --root  Draw on the root window.
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36       --window-id number
37               Draw on the specified window.
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39       --delay number
40               Per-frame delay, in microseconds.  Default:  30000  (0.03  sec‐
41               onds).
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43       --duration number
44               Length of time until loading a new image. Default: 2 minutes.
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46       --duration2 number
47               Length of time until increasing or decreasing the triangulation
48               depth.  Default: 0.4 seconds.
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50       --max-depth number
51               The maximum number of triangles to render.  Default: 40000.
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53       --max-resolution pixels
54               The size of the loaded image will be constrained to this  width
55               or  height,  to reduce the number of pixels examined.  Think of
56               it as an initial low-pass filter.  Default 1024.
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58       --outline | --no-outline
59               Whether to outline the triangles.
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61       --fill-screen | --no-fill-screen
62               Whether to zoom in on the image to completely fill the  screen,
63               or to center it.
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65       --fps | --no-fps
66               Whether  to  show  a frames-per-second display at the bottom of
67               the screen.
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ENVIRONMENT

70       DISPLAY to get the default host and display number.
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72       XENVIRONMENT
73               to get the name of a resource file that  overrides  the  global
74               resources stored in the RESOURCE_MANAGER property.
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76       XSCREENSAVER_WINDOW
77               The window ID to use with --root.
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SEE ALSO

80       X(1), xscreensaver(1)
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83       Copyright © 2014-2018 by Jamie Zawinski.  Permission to use, copy, mod‐
84       ify, distribute, and sell this software and its documentation  for  any
85       purpose  is  hereby  granted without fee, provided that the above copy‐
86       right notice appear in all copies and that both that  copyright  notice
87       and this permission notice appear in supporting documentation.  No rep‐
88       resentations are made about the suitability of this  software  for  any
89       purpose.  It is provided "as is" without express or implied warranty.
90

AUTHOR

92       Jamie Zawinski.
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96X Version 11               6.08-1.fc39 (17-Oct-2023)          tessellimage(6x)
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