File > Export > Adobe PDF Print.
Best choice is PDF X/4
Thank you. So the High Resolution option is not the best quality?
I’m giving you’re the recommended standard. You should ask your printer.
Resolution and quality begins with the choice of graphic and images you are importing:
- If you have vectors, like a logo or a drawing use AI or PDF/X-4, avoid EPS, PDF/X-1a or X-3 when you import graphics.
- If you have images, take care that the effective resolution is 300ppi or higher (I would also accept 240ppi). You can see the effective resolution if you open the link panel and select an image, you see it in the bottom part.
- If you have images with transparency, use PSD or PDF/X-4, without transparency you can import JPGs with high or maximum quality.
If this is done, export a PDF/X-4 (or any standard the printer requires).
Take care, that the output color space is according the requirements of the printer. In Europe it is mostly ECI 300 from http://www.eci.org
In U.S. and other countries are different Color Spaces used.