pnmtojpeg(1) on Linux
The text 8b441da44f45, as Debian 12 (Bookworm) shipped it.
convert PNM image to a JFIF ("JPEG") image
Flags it lists
-
-arithmetic -
-baseline -
-comment -
-dct -
-density -
-exif -
-grayscale -
-greyscale -
-maxmemory -
-optimize -
-progressive -
-qslots -
-qtables -
-quality -
-restart -
-rgb -
-sample -
-scans -
-smooth -
-tracelevel -
-verbose