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Pbmmask User Manual

pbmmask

Updated: 08 August 1989
Table Of Contents  

NAME

pbmmask - create a mask bitmap from a regular bitmap  

SYNOPSIS

pbmmask [-expand] [pbmfile]  

DESCRIPTION

This program is part of Netpbm.

pbmmask reads a PBM image as input and Generates a corresponding mask of the foreground areas as another PBM image.

The color to be interpreted as "background" is determined automatically. Regardless of which color is background, the mask will be white where the background is and black where the figure is.

This lets you do a masked paste like this, for objects with a black background: 

    pbmmask obj > objmask
    pnmpaste < dest -and objmask <x> <y> | pnmpaste -or obj <x> <y>
For objects with a white background, you can either invert them or add a step: 
    pbmmask obj > objmask
    pnminvert objmask | pnmpaste -and obj 0 0 > blackback
    pnmpaste < dest -and objmask <x> <y> | pnmpaste -or blackback <x> <y>
Note that this three-step version works for objects with black backgrounds too, if you don't care about the wasted time.

You can also use masks with grayscale and color images, using the pnmarith tool. For instance: 

    ppmtopgm obj.ppm | pamditherbw -threshold | pbmmask > objmask.pbm
    pnmarith -multiply dest.ppm objmask.pbm > t1.ppm
    pnminvert objmask.pbm | pnmarith -multiply obj.ppm - > t2.ppm
    pnmarith -add t1.ppm t2.ppm
An interesting variation on this is to pipe the mask through pnmsmooth before using it. This makes the boundary between the two images less sharp.  

OPTIONS

-expand
Expands the mask by one pixel out from the image. This is useful if you want a little white border around your image. (A better solution might be to turn the pbmlife program into a general cellular automaton tool...)
 

SEE ALSO

ppmcolormask, pnmpaste, pnminvert, pnmarith, pnmsmooth pbm,  

AUTHOR

Copyright (C) 1988 by Jef Poskanzer.
 

Table Of Contents


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