force grayscale

[casueps]

> casueps wrote:
> > The driver for my printer does not allow choosing between color or
> > grayscale, so I can only choose if the program options allow it. I want to make a filter in cups so that every user that prints through it with any program can print in grayscale.
> > I found the ghostscript command that reads a color PS file and outputs a grayscale PS file but I don't know how to insert it into the printer  options. Can you help me?
> >
> >
>
> Tell us what printer you are using. If it is a native PostScript printer, there may be a chance
> to force the printer do act as a grayscale device.
>

It's a Canon CLC3220. I think it's a native PostScript printer.