1Ppmrough User Manual(0) Ppmrough User Manual(0)
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6 ppmrough - create PPM image of two colors with a ragged border between
7 them
8
11 ppmrough
12 [-left pixels]
14 [-right pixels]
16 [-top pixels]
18 [-bottom pixels]
20 [-width pixels]
22 [-height pixels]
24 [-bg colorspec]
26 [-fg colorspec]
28 [-var pixels]
30 [-randomseed seed]
32 [-verbose]
34 All options can be abbreviated to their shortest unique prefix. You
36 may use two hyphens instead of one. You may separate an option name
37 and its value with white space instead of an equals sign.
38
41 This program is part of Netpbm(1).
42 ppmrough generates a PPM image of the specified width, height, and col‐
44 ors. ppmrough tiles the image into semi-rectangular regions with a
45 ragged borders between them. It calculates the fluctuations with the
46 rand() standard C library function.
47 ppmrough writes the PPM image to Standard Output.
49 The maxval of the output image is 255 (You can change this with
51 pamdepth).
52 Use the options -left or -right, respectively, to make vertical bor‐
54 ders, and -top or -bottom, respectively, to generate horizontal borders
55 inside the image. Each of these options needs an integer value pixels
56 that determines the average distance of the interior border to the
57 related edge of the image. You may combine the -left, -right, -top,
58 and -bottom options to generate an image with more than one border.
59 The algorithm ensures that you can concatenate two images produced with
60 the same (i.e. -left) value without dislocations.
61 You specify the dimensions of the generated image with the -width and
63 -height options.
64 Use the -bg and -fg options to set the background (margin) color and
66 the foreground (interior) color, respectively. If you don't specify
67 any of the -left, -right, -top, and -bottom options, all pixels are set
68 to foreground color. The defaults are white foreground and black back‐
69 ground.
70 Use the -var option to control the "raggedness" of the border. The
72 less its value is the smoother the border is. You can initialize the
73 pseudo-random generator with the -init option.
74 You could use ppmrough with ppmtopgm to create a PGM transparency mask
76 and use it to roughen up the edges of another image.
77
80 -left=pixels
81 Specifies the mean distance of the border from the left margin
82 (default: no border).
83 -right=pixels
86 Specifies the mean distance of the border from the right margin
87 (default: no border).
88 -top=pixels
91 Specifies the mean distance of the border from the top margin
92 (default: no border).
93 -bottom=pixels
96 Specifies the mean distance of the border from the bottom margin
97 (default: no border).
98 -width=pixels
101 Specifies the width of the image (default: 100).
102 -height=pixels
105 Specifies the height of the image (default: 100).
106 -bg=colorspec
109 Background color. colorspec is as described for the argument of
110 the ppm_parsecolor() library routine ⟨libppm.html#colorname⟩ .
111 Default is black.
112 -fg=color
115 Foreground color. colorspec is as described for the argument of
116 the ppm_parsecolor() library routine ⟨libppm.html#colorname⟩ .
117 Default is white.
118 -var=pixels
121 Specifies the variance of the ragged border (default: 10). Must
122 be a positive integer. Set pixels to 1 to get a straight bor‐
123 der.
124 -randomseed=seed
127 Use this option to initialize the pseudo-random number generator
128 (the Standard C library srand() function) with seed.
129 Before Netpbm 10.61 (December 2012), this is called -init, and
131 that still works.
132 -verbose
135 Run ppmrough in verbose mode. It reports all parameters on
136 Standard Error.
137
142 ppmmake(1), pnmcat(1), ppmtopgm(1), ppm(1),
143
146 This program was added to Netpbm in Release 10.9 (September 2002).
147
150 Copyright (C) 2002 by Eckard Specht.
151
153 This manual page was generated by the Netpbm tool 'makeman' from HTML
154 source. The master documentation is at
155 http://netpbm.sourceforge.net/doc/ppmrough.html
157netpbm documentation 23 August 2002 Ppmrough User Manual(0)