When I make high res pdfs to send to the printer, they often have thin white lines in them that seem to be very visible when they are displayed in email. This panicks my clients. When the files are opened in Acrobat, they look OK most of the time, but sometimes they still have the white lines. What causes this and how can I make it STOP!!! It is driving me and my clients nuts.
I am using Acrobat 8 Professional on a iMac OSX 10.6.8. My files are pretty standard for print pubs. They usually contain type and images, and the images get the white lines where the text boxes are in the source file. It is maddening.