Degraded print in pdf files
When I save an article from the internet as a pdf file, the print on my saved file is degraded. The letters do not look solid. This makes the text difficult to read. This does not happen with files that I scan into a pdf file. The print looks the same (degraded) when the files are opened in Preview. I just wasted well over an hour online with Adobe tech support. The technician tried to convince me that the problem is the resolution on my computer but I'm using the native resolution and only the pdf files look strange.
Has this happened to anyone else and do you know how to fix it?
MacBook Pro, Mac OS X (10.6.8)