Viewing Overprints in Acrobat
Acrobat Reader and the full version of Acrobat view pdfs very differently! If you only have Acrobats’ free reader version then you won’t be viewing documents correctly for ‘print’. We use a full version of Acrobat plus Enfocus Pitstop for editing pdfs. This allows us to changea vast array of elements within a supplied pdf. However if the original document is set up incorrectly there may be elements that just wont work when it is submitted to print. The most common by far is white type on a coloured background which is setup to overprint, if you overprint white over a colour it will disappear when printed! not what you want to see on your final print job.
We would always recommend having a paperproof - this would show up the problems. The process for making proofs is the same for platemaking, however, most customers don’t require paper proofs and have a pdf emailed to them as there ’soft proof’, this is where the problems start. If you use Acrobat Reader then you can only view the document with overprint off (there is no option to enable this) - this shows the document as you probably expect to see it with everything in place, now view the same document with a full version of Acrobat Professional, and make sure the overprint setting is on, suddenly all the overprints disappear, and this is exactly how it would be reproduced to print.
We always make sure we check documents but sometimes they slip through the net. If you don’t havetime for proofs then at least provide us with up to date laser run outs, at least then we can check the contents of the pdfs against them. For the most part try not to adjust trap settings in an application, all ofthe print packages ie. Quark, Indesign, Illustrator and so on have the correct default set up for trapping, if you should need to change it then you must at least understand the basics of trapping. Most printers prefer to add the trap themselves and this is done by the pre rip software, these settings have taken time to get right, so If you want to achieve a special effect with trapping get some advice first - otherwise you are heading for trouble!

Home