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1 perry 1 pnminterp
2 !!!pnminterp
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 BUGS
8 SEE ALSO
9 AUTHOR
10 ----
11 !!NAME
12
13
14 pnminterp - scale up portable anymap by interpolating between pixels.
15 !!SYNOPSIS
16
17
18 __pnminterp__ [[__-blackedge__] [[__-dropedge__]
19 ''N'' [[''pnmfile'']
20
21
22 You can use the minimum unique abbreviation of the
23 options.
24 !!DESCRIPTION
25
26
27 Pnminterp scales up pictures, producing output with one
28 ''N''x''N'' pixel for each pixel in the original
29 image. Where pnminterp improves over using
30 pnmscale/pnmenlarge for this is that it interpolates between
31 pixels, producing better-looking output.
32
33
34 To scale up to non-integer pixel sizes, e.g. 2.5, try
4 perry 35 pnminterp-gen(1) instead.
1 perry 36 !!OPTIONS
37
38
39 The options let you select alternative methods of dealing
40 with the right/bottom edges of the picture. Since the
41 interpolation is done between the top-left corners of the
42 scaled-up pixels, it's not obvious what to do with the
43 right/bottom edges. The default behaviour is to scale those
44 up without interpolation (more precisely, the right edge is
45 only interpolated vertically, and the bottom edge is only
46 interpolated horizontally), but there are two other
47 possibilities, listed below.
48
49
50 __-blackedge__
51
52
53 interpolate to black at right/bottom edges.
54
55
56 __-dropedge__
57
58
59 drop one (source) pixel at right/bottom edges. This is
60 arguably more logical than the default behaviour, but it
61 means producing output which is a slightly odd
62 size.
63 !!BUGS
64
65
66 Usually produces fairly ugly output for PBMs. For most PBM
67 input you'll probably want to reduce the `noise' first using
68 something like pnmnlfilt(1).
69
70
71 Always produces images with a maxval of 255, which may lose
72 sample resolution if the input is (say) a 16-bit
73 PGM.
74 !!SEE ALSO
75
76
77 pnmenlarge(1), pnmscale(1),
78 pnmnlfilt(1)
79 !!AUTHOR
80
81
82 Russell Marks (russell.marks@ntlworld.com).
83 ----
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