phpman > man > pnmalias(1)

Che Dong

⚡ TLDR: pnmalias (tldr-pages)

Apply antialiasing onto a PNM image.

Perform antialiasing on a PNM image, taking black pixels as background and white pixels as foreground
pnmalias {{path/to/input.pnm}} > {{path/to/output.ppm}}
Explicitly specify the background and foreground color
pnmalias -bcolor {{background_color}} -fcolor {{foreground_color}} {{path/to/input.pnm}} > {{path/to/output.ppm}}
Apply altialiasing to foreground pixels only
pnmalias {{-fo|-fonly}} {{path/to/input.pnm}} > {{path/to/output.ppm}}
Apply antialiasing to all surrounding pixels of background pixels
pnmalias {{-ba|-balias}} {{path/to/input.pnm}} > {{path/to/output.ppm}}

pnmalias(1) General Commands Manual pnmalias(1)

NAME
pnmalias - antialias a portable anyumap.

SYNOPSIS
pnmalias [-bgcolor color] [-fgcolor color] [-bonly] [-fonly] [-balias] [-falias] [-weight w]
[pnmfile]

DESCRIPTION
Reads a portable anymap as input, and applies anti-aliasing to background and foreground pix‐
els. If the input file is a portable bitmap, the output anti-aliased image is promoted to a
graymap, and a message is printed informing the user of the change in format.

OPTIONS
-bgcolor colorb, -fgcolor colorf
set the background color to colorb, and the foreground to color to colorf. Pixels
with these values will be anti-aliased. by default, the background color is taken to
be black, and foreground color is assumed to be white. The colors can be specified in
five ways:

o A name, assuming that a pointer to an X11-style color names file was compiled in.

o An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are each 1- to
4-digit hexadecimal numbers.

o An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point
numbers between 0 and 1.

o For backwards compatibility, an old-X11-style hexadecimal number: #rgb, #rrggbb,
#rrrgggbbb, or #rrrrggggbbbb.

o For backwards compatibility, a triplet of numbers separated by commas: r,g,b,
where r g and b are floating point numbers between 0 and 1. (This style was
added before MIT came up with the similar rgbi style.)

Note that even when dealing with graymaps, background and foreground colors need to be
specified in the fashion described above. In this case, background and foreground
pixel values are taken to be the value of the red component for the given color.

-bonly, -fonly
Apply anti-aliasing only to background (-bonly), or foreground (-fonly) pixels.

-balias, -falias
Apply anti-aliasing to all pixels surrounding background (-balias), or foreground
(-falias) pixels. By default, anti-aliasing takes place only among neighboring back‐
ground and foreground pixels.

-weight w
Use w as the central weight for the aliasing filter. W must be a real number in the
range 0 < w < 1. The lower the value of w is, the "blurrier" the output image is.
The default is w = 1/3.

SEE ALSO
pbmtext(1), pnmsmooth(1), pnm(5)

AUTHOR
Copyright (C) 1992 by Alberto Accomazzi, Smithsonian Astrophysical Observatory.

30 April 1992 pnmalias(1)

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