I started scanning a few documents to keep a digital record, and noticed that when I tried opening the scans as PDF's, the document was just black. So I opened the prefs for preview and toggled a few things on and off. Turning off the smooth text option allowed the document to be displayed, but without smoothing, it's tougher to read. Re-enabling the option makes it black again. I'm not a fan of Acrobat reader so I'd rather not use it, so I was wondering if anyone knows if this is a common issue with Yosemite or does preview generally suck for PDF viewing?