pamarith(1) on Linux
The text ed36bc82f0db, as Debian 13 (Trixie) shipped it.
perform arithmetic on two Netpbm images
Flags it lists
-
-add -
-and -
-closeness -
-compare -
-difference -
-divide -
-equal -
-maximum -
-minimum -
-multiply -
-nand -
-nor -
-or -
-shiftleft -
-shiftright -
-subtract -
-xor