Understanding Actual PPi vs Effective PPi?

[jovial wigeon]

Is there a good link I can learn about this from or a course? Would be great to understand this and how to check files before it going to print.

[dense hatch]

Hello

I am photoshop expert that make print-ready file

Could we chat together?

[tired garnet]

Let me try to get you something: It might be a while so I can get the proper doc (lots of things about the subject on the internet are mere crap, just so you know 🙂 )

[tired garnet]

Are you trying to sell something?