# pbmclean(1) - man - phpman

> **TLDR:** Clean up a PBM image by erasing isolated black and white pixels.
>
- Clean up a PBM image by erasing isolated black and white pixels:
  `pbmclean {{path/to/image.pbm}} > {{path/to/output.pbm}}`
- Clean up only black/white pixels:
  `pbmclean -{{black|white}} {{path/to/image.pbm}} > {{path/to/output.pbm}}`
- Specify the minimum number of neighbouring pixels of the same color in order for a pixel not to be considered isolated:
  `pbmclean {{-m|-minneighbours}} {{3}} {{path/to/image.pbm}} > {{path/to/output.pbm}}`

*Source: tldr-pages*

---

[pbmclean(1)](https://www.chedong.com/phpMan.php/man/pbmclean/1/markdown)                            General Commands Manual                           [pbmclean(1)](https://www.chedong.com/phpMan.php/man/pbmclean/1/markdown)



## NAME
       pbmclean - flip isolated pixels in portable bitmap


## SYNOPSIS
       **pbmclean** [**-minneighbors=**_N_] [**-black**|**-white**] [_pbmfile_]

       You  can use the minimum unique abbreviation of the options.  You can use two hyphens instead
       of one.  You can separate an option name from its value with white space instead of an equals
       sign.

       Before December 2001, **pbmclean** accepted **-**_N_ instead of **-minneighbors**.


## DESCRIPTION
       **pbmclean**  cleans up a PBM image of random specs.  It reads a PBM image as input and outputs a
       PBM that is the same as the input except with every pixel which has  less  than  _N_  identical
       neighbours inverted.

       The default for _N_ is 1 - only completely isolated pixels are flipped.

       (A  value  of _N_ greater than 8 generates a completely inverted image (but use **pnminvert** to do
       that) -- or a completely white or completely black image with the **-black** or **-white** option).

       **pbmclean** considers the area beyond the edges of the image to be white.   (This  matters  when
       you consider pixels right on the edge of the image).

       You can use **pbmclean** to clean up "snow" on bitmap images.


## OPTIONS
### -black

### -white -black
              **-white**, **pbmclean** flips both black and white pixels which do not have sufficient  iden‐
              tical  neighbors.   If  you specify **-black**, **pbmclean** leaves the white pixels alone and
              just erases isolated black pixels.  Vice versa  for  **-white**.   You  may  specify  both
              **-black** and **-white** to get the same as the default behavior.



## SEE ALSO
       [**pbm**(5)](https://www.chedong.com/phpMan.php/man/pbm/5/markdown)


## AUTHOR
       Copyright  (C)  1990 by Angus Duggan Copyright (C) 1989 by Jef Poskanzer.  Copyright (C) 2001
       by Michael Sternberg.

       Permission to use, copy, modify, and distribute this software and its documentation  for  any
       purpose and without fee is hereby granted, provided that the above copyright notice appear in
       all copies and that both that copyright notice and this permission notice appear in  support‐
       ing documentation.  This software is provided "as is" without express or implied warranty.



                                             18 Oct 2001                                 [pbmclean(1)](https://www.chedong.com/phpMan.php/man/pbmclean/1/markdown)