They lack vibrance and have a mild yellow/green cast. Since it is not a colour critical application (like invites to you lot might be!) they are okay - but it was disappointing to have a conversation along the lines of:
I don't understand CMYK....
That's okay - just chose "Convert to colour space" and select CMYK
Yes...that changes my working space - but there are many variations of CMYK there
Just choose the simple one
Do you have an output profile so that I can fiddle this in soft proofing?
What's an output profile?
How about I flatten this file to sRGB and send it to you for prep; you can send me a PDF proof.
