SYNOPSIS
pbmmask [-expand] [pbmfile]DESCRIPTION
Reads a portable bitmap as input. Creates a corresponding mask bitmap and writes it out.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>
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 tool into a general cellular automaton tool...)