pnmcolormap(1) on Linux
The text 82c9531882bf, as Debian 12 (Bookworm) shipped it.
create quantization color map for a Netpbm image
Flags it lists
-
-meancolor -
-meanpixel -
-sort -
-splitcolorct -
-splitpixelct -
-splitspread -
-spreadbrightness -
-spreadluminosity -
-square -
-verbose