For each job, please specify the colours used.
For example :
All elements of the same colour used in a document must have
the same colour name. If you are using a Pantone 280 in Xpress, you must use
the same Pantone 280 (same spelling) in Photoshop or in Illustrator.
Watch out for knockouts in the different colours, the screen can deceive and does not always reflect reality.
Therefore, you should make separate proofs to verify the different knockouts and separations...
This often prevents trouble; since we’re not mind readers, we can’t guess what you’re expecting to get. A lot of freedom is allowed in this domain (all for the better, of course!).
A colour on a matte or glossy paper, an inkjet proof or a
screen all provide different results.
Inkjet proofs produce results in terms of photography and density (thickness of the ink) that can not be reproduced exactly in offset (different colour space). Only calibrated inkjet proofs with press profiles, even if they are only simulations, can reasonably match the offset result.