Section: User Commands (1)
Updated: 14 April 2000
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ppmcolormask - produce mask of areas of a certain color in a PPM file
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
and white everywhere else.
The output of
is useful as an alpha mask input to
Note that you can generate such an alpha mask automatically as you convert
to PNG format with
is the input file. If you don't specify
the input is from Standard Input.
The output goes to Standard Output.
You can specify
An X11-style color name (e.g.
An X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are
each 1- to 4-digit hexadecimal numbers.
An X11-style decimal specifier: rgbi:r/g/b, where r g and b are
floating point numbers between 0 and 1.
For backwards compatibility, an old-X11-style hexadecimal number:
#rgb, #rrggbb, #rrrgggbbb, or #rrrrggggbbbb.
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
Bryan Henderson (firstname.lastname@example.org)
- SEE ALSO
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Time: 11:07:41 GMT, January 19, 2018