1Pamgetcolor User Manual(0) Pamgetcolor User Manual(0)
2
3
4
6 pamgetcolor - display the average colors from specified regions in an
7 image.
8
9
11 pamgetcolor [-format format] [-radius radius] [-linear] [-infile pam‐
12 file] region1 [region2 ...]
13
14
16 This program is part of Netpbm(1).
17
18 pamgetcolor prints the average colors of a set of circular regions in
19 the input image.
20
21 You specify a region as a positional argument of the form col‐
22 umn,row[:label], where column and row are the coordinates of the center
23 of the circle (first row of pixels is row 0; leftmost column of pixels
24 is column 0), and label an optional label that pamgetcolor shall dis‐
25 play to identify that region in its output. All regions have he same
26 radius, specified by the -radius option. The region centers must lie
27 within the image, but part of a region may fall outside the image;
28 pamgetcolor considers only the part that is within the image in calcu‐
29 lations.
30
31
32
34 To read the color of the pixel at location (10,14) in the default for‐
35 mat:
36
37 pamgetcolor 10,14 -infile test.ppm
38
39 To read the colors of three pixels in the default format, assigning a
40 label to each pixel:
41
42 pamgetcolor 10,10:topleft 100,100:middle 200,200:bottomright -infile test.ppm
43
44 To read with 16-bit precision the average color in the circle with a
45 radius of four pixels and the center at (100,100):
46
47 pamgetcolor -format int:65535 -radius 4 100,100 -infile test.ppm
48
49
50
52 In addition to the options common to all programs based on libnetpbm
53 (most notably -quiet, see
54 Common Options ⟨index.html#commonoptions⟩ ), pamgetcolor recognizes
55 the following command line options:
56
57
58
59
60 -format
61 This specifies the format in which to output the colors. The
62 output is always a Netpbm color specification
63 ⟨libppm.html#colorname⟩ ; this format tells which of the various
64 specifications for the same color the program uses.
65
66 This argument is of the form formatId[:param], where formatId
67 specifies the format and param is a positive integer parameter
68 that, depending on formatId, indicates either precision or nor‐
69 malization. The following values are possible for formatId:
70
71
72 int Samples are decimal integers normalized to the maxval specified
73 by param. Example: rgb-255:255/128/64 This format is the
74 default, with a maxval of 255.
75
76 norm Samples are floating point numbers normalized to unity. E.g.
77 rgbi:1.0/0.5/.25 param specifies precision as the number of dig‐
78 its in the fractional part.
79
80 x11 Samples are hexadecimal numbers with param digits, e.g.
81 rgb:01/ff/8000
82
83
84
85 -radius
86 sets the radius of the regions. A value of zero causes pamget‐
87 color to measure a single pixel and is the default.
88
89
90 -infile
91 This specifies the Netpbm file to analyze.
92
93 If you don't specify this option, pamgetcolor reads the image
94 from Standard Input.
95
96
97 -linear
98 This tells pamgetcolor to work with the intensity-linear varia‐
99 tion of Netpbm images where the samples are proportional to
100 light intensity rather than to brightness, as in true (gamma-
101 adjusted) Netpbm formats.
102
103
104
105
107 pnmcolormap(1),
108
109
110
112 This program was first submitted by Anton Shepelev
113 (anton.txt@gmail.com).
114
115
117 This program was new in Netpbm 10.83 (June 2018).
118
119
121 ·
122
123 SYNOPSIS ⟨#synopsis⟩
124
125 ·
126
127 DESCRIPTION ⟨#description⟩
128
129 ·
130
131 EXAMPLES ⟨#examples⟩
132
133 ·
134
135 OPTIONS ⟨#options⟩
136
137 ·
138
139 SEE ALSO ⟨#seealso⟩
140
141 ·
142
143 AUTHOR ⟨#author⟩
144
145 ·
146
147 HISTORY ⟨#history⟩
148
150 This manual page was generated by the Netpbm tool 'makeman' from HTML
151 source. The master documentation is at
152
153 http://netpbm.sourceforge.net/doc/pamgetcolor.html
154
155netpbm documentation 18 May 2018 Pamgetcolor User Manual(0)