Flatten transparencies Illustrator
Flattening transparencies is easily done via Adobe Illustrator. This way you are assured of prints that looks the way you designed it. Below you can read how to flatten transparencies in a few simple steps in Illustrator.
It is possible that your document contains images or objects that are partly transparent, which we call transparency. These transparencies are usually not visible in your file, but cannot be processed properly by the printer. This looks like this:
It is therefore important that you flatten files with such transparency. You do this as follows:
Illustrator: choose the option "Flatten transparency" under "Object".
This useful tip is one of the submission conditions for the expert.