Rendering for Print?

[glyph]

as a former print manager at a design co - what blade says is spot on - if you are doing four colour litho, proof it first
there are at least four proof methods:
they print from their calibrated printer - ok
they do an iris print - better
they do a print using the film negatives used to make the printing plates - better but technically superceded
they do a proper proof run using the printing plates - very expensive but the best

and remember your whites will only be as white as the paper
and bright greens and oranges are never good in cmyk

[AJ Jefferies]

While that's all nice in principle, the reality is that if the colours in the final print look off, the printer won't say "My fault guys!", he'll simply point out that he worked with what he was given. For example, if you're working on something that has corporate colours that *must* be an exact value (or range of values), you can give the printer an RGB file & a proof, but that specific colour is now in the lap of the gods - and it won't be the printer's fault if it turns out to be wrong.

Ultimately, if your working on something destined to print, you should do as much as you possibly can to ensure that the file you send them will turn out the way you/the client expect.

There will be countless cases where such an approach is complete overkill but it's good to know that your artwork will look as you intended it to.