Hi all, Second post for me. Seriously big thanks to member Martin Mueller for some really good simple advice with the last one! Before I go any further I would like to very respectfully say that I'm not looking for advice that ends with "buy some RIP software" or "get a denso" or a mega complicated lesson on spectophotometry. I'm a simple man (trade qualified) with a GTO in the garage, not a 10 colour speedmaster and a spare million bucks We're running positive film out of a middle of the range inkjet printer without a RIP and getting really nice results. Until we try to run a decent screen.......... My graphic designer (read: mate who I used to print newspapers with) manipulates our images in Photoshop and sends me a PDF. Whenever we try to produce a tone we end up with dots that aren't round and patterns through the screen. Most of my work is low end stuff on 80 gram bond so we're not trying to achieve anything super special. These a couple of (poor) photos attached to give an indication of the issues that we're having. We ran our first 4 colour yesterday and were quite happy with the result, except for these damn patterns through the image. Any input will be greatly appreciated. Many thanks in advance.