pnmnorm(1) on Linux
The text b00015901414, as Debian 13 (Trixie), Debian 12 (Bookworm) shipped it.
normalize the contrast in a Netpbm image
Flags it lists
-
-bpercent -
-bsingle -
-bvalue -
-colorvalue -
-keephues -
-luminosity -
-maxexpand -
-middle -
-midvalue -
-saturation -
-wpercent -
-wvalue