Printing in CMYK

Hi Guys, I hope someone can help.

I've created a satire newspaper in photoshop and when I sent it (saved as pdf) to the printers they asked for all black colours to be saved as CMYK.

I created the whole newspaper in RGB, is there an easy way to change it all to CMYK? Is it even possible in photoshop?

I am using Photoshop 7.0 and any help would be greatly appreciated. If you like a bit of satire then my newspaper can be viewed at www.thecheek.co.uk

Kind regards,

Gareth

In Photoshop 7 to convert a saved image that is already in RGB and convert it to a CMYK you need to go to image-mode and then select CMYK. then save again with those settings and you should be good.

Phantom