When I use Acrobat 8 to print scanned images to a postscript file an additional images is generated in the postscript file. Dependent on the value (1 or 2) behind the "/O" command this image appears in the pdf after I distilled the postscript with Distiller 8. Does anyone know what this "/O" command does or I can manipulate it with a setting in Acrobat 8?
/O isn't a command. It's a normal name. Some procedure somewhere is
called which will (presumably) look for this name and process it. So
you need to read the procedure, rather than look for PostScript
definitions.