pamstretch-gen
Scale a Netpbm image by a non-integer factor
TLDR
Scale an image by a non-integer factor N
$ pamstretch-gen [2.5] [input.pam] > [output.pam]
Read from standard input$ cat [input.pam] | pamstretch-gen [1.75] > [output.pam]
SYNOPSIS
pamstretch-gen N [pnmfile]
DESCRIPTION
pamstretch-gen scales a Netpbm image by an arbitrary (possibly non-integer) factor. Internally it upscales to the next integer multiple with pamstretch (which only supports integer factors) and then uses pamscale to scale back down to the requested size, producing higher-quality results than pamscale alone for modest upscaling.There are no command-line options specific to pamstretch-gen; it recognizes the common libnetpbm options (for example `-quiet` and `-plain` on recent versions).
PARAMETERS
N
Scale factor (may be a non-integer such as `1.5` or `2.75`). Applied to both dimensions.pnmfile
Input Netpbm image file. If omitted, reads from standard input.
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
Requires both pamstretch and pamscale to be available. Works only with Netpbm (PNM/PAM) images.
SEE ALSO
pamstretch(1), pamscale(1)