pnmcrop
Automatically crop borders from PNM images
TLDR
Crop borders from image
$ pnmcrop [input.pnm] > [output.pnm]
Crop only white borders$ pnmcrop -white [input.pnm] > [output.pnm]
Crop only black borders$ pnmcrop -black [input.pnm] > [output.pnm]
Crop specific sides$ pnmcrop -left -right [input.pnm] > [output.pnm]
SYNOPSIS
pnmcrop [options] [file]
DESCRIPTION
pnmcrop automatically detects and removes uniform-color borders from PNM images. It identifies rows and columns at the edges that consist entirely of the border color and trims them.By default it detects the border color automatically, but -white and -black force specific border colors. Individual sides can be cropped selectively with -left, -right, -top, and -bottom flags. Part of the Netpbm toolkit.
PARAMETERS
FILE
Input PNM file.-white
Crop white borders.-black
Crop black borders.-left
Crop left side only.-right
Crop right side only.-top
Crop top only.-bottom
Crop bottom only.-verbose
Show cropping information.
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
Border color must be uniform. Part of Netpbm suite.
HISTORY
pnmcrop was created as part of Netpbm for automatic image border removal.