pbmclean
removes isolated pixels
TLDR
Remove noise from bitmap
$ pbmclean [input.pbm] > [output.pbm]
Set minimum connected size$ pbmclean -minneigh=[4] [input.pbm] > [output.pbm]
Flip black/white for cleaning$ pbmclean -black [input.pbm] > [output.pbm]
SYNOPSIS
pbmclean [options] [file]
DESCRIPTION
pbmclean removes isolated pixels. Cleans up noisy bitmaps.The tool removes speckles. Part of Netpbm.
PARAMETERS
FILE
Input PBM file.-minneigh N
Minimum neighbor count.-black
Clean black pixels.-white
Clean white pixels.
INSTALL
sudo apt install netpbm
sudo dnf install netpbm
sudo pacman -S netpbm
sudo apk add netpbm
sudo zypper install netpbm
brew install netpbm
nix profile install nixpkgs#netpbm
CAVEATS
Part of Netpbm. PBM format only. May remove small details.
HISTORY
pbmclean is part of Netpbm for cleaning bitmap images.