pnmpad(1) on Linux
The text e04e8d10f555, as Debian 12 (Bookworm) shipped it.
add borders to a PNM image
Flags it lists
-
-black -
-bottom -
-halign -
-height -
-left -
-mheight -
-mwidth -
-reportonly -
-right -
-top -
-valign -
-verbose -
-white -
-width