1Pnmalias User Manual(0) Pnmalias User Manual(0)
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6 pnmalias - antialias a PNM image
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10 pnmalias
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12 [-bgcolor color]
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14 [-fgcolor color]
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16 [-bonly]
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18 [-fonly]
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20 [-balias]
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22 [-falias]
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24 [-weight w]
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26 [pnmfile]
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30 This program is part of Netpbm(1).
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32 pnmalias reads a PNM image as input, and applies anti-aliasing to back‐
33 ground and foreground pixels. If the input file is a PBM, pnmalias
34 promotes the output anti-aliased image to a PGM, and prints a message
35 informing the user of the change in format.
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39 In addition to the options common to all programs based on libnetpbm
40 (most notably -quiet, see
41 Common Options ⟨index.html#commonoptions⟩ ), pnmalias recognizes the
42 following command line options:
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44 -bgcolor colorb sets the background color the colorb.
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46 -fgcolor colorf sets the foreground color to colorf.
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48 Pixels with these values will be anti-aliased. By default, pnmalias
49 takes the background color to be black, and foreground color to be
50 white.
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52 Specify the color (color) as described for the argument of the
53 pnm_parsecolor() library routine ⟨libnetpbm_image.html#colorname⟩ .
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55 Note that even when dealing with PGMs, background and foreground colors
56 need to be specified in the fashion described above. In this case,
57 pnmalias takes the background and foreground pixel values to be the
58 value of the red component for the specified color.
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60 -bonly says to apply anti-aliasing only to the background pixels.
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62 -fonly says to apply anti-aliasing only to the foreground pixels.
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64 -balias says to apply anti-aliasing to all pixels surrounding back‐
65 ground pixels.
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67 -falias says to apply anti-aliasing to all pixels surrounding fore‐
68 ground pixels.
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70 If you specify neither -balias nor -falias, pnmalias applies anti-
71 aliasing only among neighboring background and foreground pixels.
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73 -weight w says to use w as the central weight for the aliasing filter.
74 w must be a real number in the range 0 < w < 1. The lower the value of
75 w is, the "blurrier" the output image is. The default is w = 1/3.
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79 pbmtext(1), pnmsmooth(1), pnm(1)
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83 Copyright (C) 1992 by Alberto Accomazzi, Smithsonian Astrophysical
84 Observatory.
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87 This manual page was generated by the Netpbm tool 'makeman' from HTML
88 source. The master documentation is at
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90 http://netpbm.sourceforge.net/doc/pnmalias.html
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92netpbm documentation 15 March 2004 Pnmalias User Manual(0)