pnmalias(1)pnmalias(1)NAMEpnmalias - antialias a portable anyumap.
SYNOPSISpnmalias [-bgcolor color] [-fgcolor color] [-bonly]
[-fonly] [-balias] [-falias] [-weight w] [pnmfile]
DESCRIPTION
Reads a portable anymap as input, and applies anti-alias
ing to background and foreground pixels. If the input
file is a portable bitmap, the output anti-aliased image
is promoted to a graymap, and a message is printed inform
ing the user of the change in format.
OPTIONS-bgcolor colorb, -fgcolor colorf
set the background color to colorb, and the fore
ground to color to colorf. Pixels with these val
ues will be anti-aliased. by default, the back
ground 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 hex
adecimal 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 num
bers 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, back
ground 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 back
ground (-balias), or foreground (-falias) pixels.
By default, anti-aliasing takes place only among
neighboring background and foreground pixels.
-weight w
Use w as the central weight for the aliasing fil
ter. 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 ALSOpbmtext(1), pnmsmooth(1), pnm(5)AUTHOR
Copyright (C) 1992 by Alberto Accomazzi, Smithsonian
Astrophysical Observatory.
30 April 1992 pnmalias(1)
