I don't claim to be an expert in print media, but I have been getting stuff printed professionally for a while. Today I'm using a new printer for the first time, and they've come back asking for this:
"Ideally we could do with the black being reduced though to 40% Cyan,40% Magenta,40% Yellow,100% Black, as this is the maximum coverage our press can take."
I don't know what they're asking me for to be honest - how can I globally adjust the black in my images? I'm using photoshop and sent them PDFs.
Any help appreciated, I need to get the proofs signed off today.