Advice needed on printing high quality graphics in PDFs generated by PHP

[OM2]

I'm having a mini application developed to create A4 PDF's using PHP

 

A key part of the project needs to be able to insert high quality graphics into the document that when printed out look really sharp

 

Some of the graphics are variable and don't always have to be printed

 

I just wanted to know if there was a general guide on what graphics and quality to use?

 

The graphics I need printed print really well when put into a Word document at 300 resolution - so I can't see why there should be any problems inserting into a PDF - these graphics are PNG ones

 

Unfortunately, if I insert the same PNG format into the PDF via the PHP code, the graphic turns out to be REALLY big

 

Just looking for advice

 

Thanks

 

 

OM