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ppmcolormask
!!!ppmcolormask
NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHOR
----
!!NAME


ppmcolormask - produce mask of areas of a certain color in a PPM file
!!SYNOPSIS


__ppmcolormask__ ''color''
[[''ppmfile'']
!!DESCRIPTION


Reads a PPM file as input. Produces a PBM (bitmap) file as
output. The output file is the same dimensions as the input
file and is black in all places where the input file is the
color ''color'', and white everywhere else.


The output of __ppmcolormask__ is useful as an alpha mask
input to __pnmcomp__. Note that you can generate such an
alpha mask automatically as you convert to PNG format with
pnmtopng(1). Use its __-transparent__
option.


''ppmfile'' is the input file. If you don't specify
''ppmfile'', the input is from Standard
Input.


The output goes to Standard Output.


You can specify ''color'' five ways:


o


An X11-style color name (e.g. __black__).


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.)
!!SEE ALSO


pgmtoppm(1), pnmcomp(1), pbmmask(1),
__ppm(5)__
!!AUTHOR


Bryan Henderson (bryanh@giraffe-data.com)
----

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Last edited on Tuesday, June 4, 2002 12:22:45 am by "perry"

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