2up printing - incorrect page size?

[Dave Foster]

Hello all,

As part of an automated printing solution, I want to print a 2 page (A4 portrait) PDF/PS file onto A3 2up. However, if I say:

lp -o media=A3 -o numberup=2 filename

(or similar in an C Xcode project), the result is that the page size is half as big as it needs to be - i.e. the size it would be if it were printing 2up onto A4. The positioning of the pages is, however, correct.

-o fit-to-page and -o scaling have no effect.

Is there any way I can achieve the results I'm after? I'm trying to avoid using any other methods (printing from Acrobat etc) otherwise the automation is useless! I'm on Mac OSX 10.5.7.

Many thanks,

Dave