Well I sent my design work (used illustrator CS4) to offset printer and it came out one picture dropped.
The offset printer says beucase "the pdf was not flattened".
Now, I need to send it again to them and wondering if you could help me to avoid the same issue happening again...
How should I "flatten" the PDF??
Have been searching the solutions but not sure exactly what process I need to do.
Europe, Middle East and Africa