Double sided print with color and b/w

[Jan]

Hi,

I have a Mac (10.7.1) with Cups 1.5 and a "Konica Minolta bizhub C452" printer. I print over CLI and it works fine like this.

lp -d MYPRINTER -o KMInputSlot=Tray1 -o KMDuplex=Double -o SelectColor=Grayscale

Now I would like to print on the front of the page in color and on the back in b/w. I installed Ghostscript and Foomatic on this Mac but i don't know how to use it properly with the PPD of Konica.

lp -d MYPRINTER -o KMInputSlot=Tray1 -o KMDuplex=Double -o 2:SelectColor=Grayscale

does a double-sided-print but both sides in color. I think I use foomatic not properly...

Is there an other way than with foomatic to solve this?

Thanks!
Jan