Images imported into Pages are blurry when sent as PDF
Just got Pages and am trying to produce my first newsletter. Using a template, I dragged some images over an existing image in the template. I also added some images on my own and used the masking tool to crop them. Pics varied in size from 1200x1600 to 3264x2448. They looked good in Pages, but when I used the Send via Mail as PDF function, all of the images appeared blurry in the PDF.
Can someone tell me what I did wrong and how I can get clear pics in my newsletter?
Thanks.
Pages-OTHER, OS X Mountain Lion (10.8.2)