When I fired command and see the printing result
lpr -P printer-#1 -o fitplot test.pdf
Transparency PNG will be go black square.
But If I manually convert my PDF to Postscript and fired command.
lpr -P printer-#1 -o fitplot test.ps
Then its fine.
And I also try send PDF file in unfiltered way.
lpr -P printer-#1 -o fitplot -o raw test.pdf
it also fine.
I think problem is filtering process but still no idea..