images in preview

Dear Turtle,

I see you are very active in helping others here, and I was hoping you'd see my post on a related user forum. Since it didn't show up here, I'll repost the question - I am uploading JPG scans of notepaper for an e-commerce catalog in Website Creator, and I have tried various resolutions - 600 dpi, 1200 dpi - but when I look at the enlarged image in the Preview tab, it is all blurry and pixellated - is it going to look this bad when I publish the website, or is this a "fluke" of the Preview tab? The thumbnail images look fine, but too small to read the text of the notepaper, so an enlargement option is a "must" for people who are browsing the catalog.

Thanks for any help you can give - AgnesM