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1 perry 1 ppmcolormask
2 !!!ppmcolormask
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 SEE ALSO
7 AUTHOR
8 ----
9 !!NAME
10
11
12 ppmcolormask - produce mask of areas of a certain color in a PPM file
13 !!SYNOPSIS
14
15
16 __ppmcolormask__ ''color''
17 [[''ppmfile'']
18 !!DESCRIPTION
19
20
21 Reads a PPM file as input. Produces a PBM (bitmap) file as
22 output. The output file is the same dimensions as the input
23 file and is black in all places where the input file is the
24 color ''color'', and white everywhere else.
25
26
27 The output of __ppmcolormask__ is useful as an alpha mask
28 input to __pnmcomp__. Note that you can generate such an
29 alpha mask automatically as you convert to PNG format with
30 pnmtopng(1). Use its __-transparent__
31 option.
32
33
34 ''ppmfile'' is the input file. If you don't specify
35 ''ppmfile'', the input is from Standard
36 Input.
37
38
39 The output goes to Standard Output.
40
41
42 You can specify ''color'' five ways:
43
44
45 o
46
47
48 An X11-style color name (e.g. __black__).
49
50
51 o
52
53
54 An X11-style hexadecimal specifier: rgb:r/g/b, where r g and
55 b are each 1- to 4-digit hexadecimal numbers.
56
57
58 o
59
60
61 An X11-style decimal specifier: rgbi:r/g/b, where r g and b
62 are floating point numbers between 0 and 1.
63
64
65 o
66
67
68 For backwards compatibility, an old-X11-style hexadecimal
69 number: #rgb, #rrggbb, #rrrgggbbb, or
70 #rrrrggggbbbb.
71
72
73 o
74
75
76 For backwards compatibility, a triplet of numbers separated
77 by commas: r,g,b, where r g and b are floating point numbers
78 between 0 and 1. (This style was added before MIT came up
79 with the similar rgbi style.)
80 !!SEE ALSO
81
82
83 pgmtoppm(1), pnmcomp(1), pbmmask(1),
84 __ppm(5)__
85 !!AUTHOR
86
87
88 Bryan Henderson (bryanh@giraffe-data.com)
89 ----
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