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1 perry 1 ppmdither
2 !!!ppmdither
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 SEE ALSO
8 AUTHOR
9 ----
10 !!NAME
11
12
13 ppmdither - ordered dither for color images
14 !!SYNOPSIS
15
16
17 __ppmdither__ [[__-dim__ ''power''] [[__-red__
18 ''shades''] [[__-green__ ''shades''] [[__-blue__
19 ''shades''] [[''ppmfile'']
20 !!DESCRIPTION
21
22
23 Reads a portable pixmap as input, and applies dithering to
24 it to reduce the number of colors used down to the specified
25 number of shades for each primary. The default number of
26 shades is red=5, green=9, blue=5, for a total of 225 colors.
27 To convert the image to a binary rgb format suitable for
28 color printers, use -red 2 -green 2 -blue 2.
29 !!OPTIONS
30
31
32 __-dim__ ''power''
33
34
35 The size of the dithering matrix. The dithering matrix is a
36 square whose dimension is a power of 2. ''power'' is that
37 power of 2. The default is 4, for a 16 by 16
38 matrix.
39
40
41 __-red__ ''shades''
42
43
44 The number of red shades to be used, including black;
45 minimum of 2.
46
47
48 __-green__ ''shades''
49
50
51 The number of green shades to be used, including black;
52 minimum of 2.
53
54
55 __-blue__ ''shades''
56
57
58 The number of blue shades to be used, including black;
59 minimum of 2.
60 !!SEE ALSO
61
62
63 pnmdepth(1), ppmquant(1), ppm(5)
64 !!AUTHOR
65
66
67 Copyright (C) 1991 by Christos Zoulas.
68 ----
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