1Pampaintspill User Manual(0) Pampaintspill User Manual(0)
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6 pampaintspill - smoothly spill colors into the background
7
10 pampaintspill [--bgcolor=color] [--wrap] [--all] [--downsample=number]
11 [--power=number] [filename] [-randomseed=integer]
12 Minimum unique abbreviations of option are acceptable. You may use
14 double hyphens instead of single hyphen to denote options. You may use
15 white space in place of the equals sign to separate an option name from
16 its value.
17
20 This program is part of Netpbm(1).
21 pampaintspill produces a smooth color gradient from all of the non-
23 background-colored pixels in an input image, effectively "spilling
24 paint" onto the background. pampaintspill is similar to pamgradient
25 but differs in the following characteristics:
26 • pampaintspill accepts any number of paint
30 sources (non-background-colored pixels), which can lie
31 anywhere
32 on the canvas. pamgradient accepts exactly
33 four paint sources, one in each corner of the image.
34 • pampaintspill requires an input image while
37 pamgradient generates a new image from
38 scratch.
39 • pampaintspill can produce tileable output and
42 can control how tightly the gradient colors bind to their
43 source
44 pixels.
45 Results are generally best when the input image contains just a few,
48 crisp spots of color. Use your drawing program's pencil tool - as op‐
49 posed to a paintbrush or airbrush tool - with a small nib.
50
53 In addition to the options common to all programs based on libnetpbm
54 (most notably -quiet, see
55 Common Options ⟨index.html#commonoptions⟩ ), pampaintspill recognizes
56 the following command line options:
57 --bgcolor=color
61 Explicitly specify the background color. color can be
63 specified using any of the formats accepted by the
64 pnm_parsecolor() library routine
65 ⟨libnetpbm_image.html#colorname⟩ such as red or #ff0000. If
66 --bgcolor is not specified, pampaintspill makes an
67 educated guess about the background color based on the
68 colors in the
69 image's corners.
70 --wrap
73 Allow gradients to wrap around image borders. That is, colors
75 that spill off the right side of the image reappear on the
76 left side of
77 the image and likewise for left/right, top/bottom, and
78 bottom/top. --wrap makes images tileable, which is nice
79 for
80 producing desktop backgrounds.
81 --all
84 Recolor all pixels, not just background pixels. Normally,
86 non-background-colored pixels in the input image appear
87 unmodified in
88 the output image. With --all, all pixels are colored
89 based on their distance from all of the (other) non-back‐
90 ground-colored
91 pixels.
92 --downsample=number
95 Ignore all but number non-background-colored pixels.
97 When a large number of pixels in the input image differ in
98 color from
99 the background, pampaintspill runs very slowly. The
100 --downsample option randomly selects a given number of
101 colored
102 pixels to use as paint sources for the gradients and ig‐
103 nores the rest,
104 thereby trading off image quality for speed of execution.
105 --power=number
108 Control how color intensity changes as a function of the
110 distance from a paint source. The default value for number
111 is
112 -2.0, which means that intensity drops (because of the mi‐
113 nus sign) with
114 the square (because of the 2.0) of the distance from each
115 paint
116 source. -2.0 generally works well in practice, but other
117 values can be
118 specified for various special effects. With very small
119 numbers of paint
120 sources, -1.0 may produce subtler gradients, but these get
121 muddier as
122 the number of paint sources increases. Positive numbers
123 (e.g., 1.0 and
124 2.0) make the paint sources stand out in the output image
125 by pushing the
126 gradients away from them.
127 -randomseed=integer
129 This is the seed for the random number generator that generates
131 the
132 pixels.
133 Use this to ensure you get the same image on separate invoca‐
135 tions.
136 This option was new in Netpbm 10.94 (March 2021).
138
143 •
144 pamgradient(1)
146 •
148 ppmmake(1),
150 •
152 ppmrainbow(1),
154 •
156 pgmramp(1),
158 •
160 ppmpat(1),
162 •
164 pam(1)
166
170 pampaintspill was new in Netpbm 10.50 (March 2010).
171
175 Copyright © 2010 Scott Pakin, scott+pbm@pakin.org.
176
179 •
180 SYNOPSIS ⟨#synopsis⟩
182 •
184 DESCRIPTION ⟨#description⟩
186 •
188 OPTIONS ⟨#options⟩
190 •
192 SEE ALSO ⟨#seealso⟩
194 •
196 HISTORY ⟨#history⟩
198 •
200 COPYRIGHT ⟨#copyright⟩
202
204 This manual page was generated by the Netpbm tool 'makeman' from HTML
205 source. The master documentation is at
206 http://netpbm.sourceforge.net/doc/pampaintspill.html
208netpbm documentation 06 March 2021 Pampaintspill User Manual(0)