pnmrotate
Rotate PNM images by an arbitrary angle
TLDR
Rotate image
$ pnmrotate [45] [input.pnm] > [output.pnm]
Rotate with background color$ pnmrotate -background [white] [30] [input.pnm] > [output.pnm]
Rotate without anti-aliasing$ pnmrotate -noantialias [30] [input.pnm] > [output.pnm]
SYNOPSIS
pnmrotate [options] angle [file]
DESCRIPTION
pnmrotate rotates PNM images by an arbitrary angle specified in degrees (between -90 and 90, measured counter-clockwise). The output image is enlarged as needed to contain the full rotated result, with new areas filled by the background color.Anti-aliasing is applied by default for smooth edges; use -noantialias to disable it for faster processing or when working with binary images. For rotations that are multiples of 90 degrees, use pamflip instead. Part of the Netpbm toolkit.
PARAMETERS
angle
Rotation angle in degrees (must be between -90 and 90). Measured counter-clockwise.-background color
Background fill color. By default, pnmrotate selects what appears to be the background color of the original image.-noantialias
Disable anti-aliasing. Simply moves pixels instead of synthesizing output pixels from multiple input 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