pnminterp(1) on Linux
The text 22fc8a431510, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
scale up a PNM or PAM image by interpolating between pixels
Flags it lists
-
-blackedge -
-dropedge -
-xscale -
-yscale