sk2ppm(1) on Linux
The text 6ebb3e06c6af, as Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
Convert a SK file into a portable pixmap
Flags it lists
-
--bbox -
--gradient-steps -
--help -
--resolution -
-b -
-h -
-r -
-s