I'm doing genealogical research and looking at scanned graphics of old censuses. It is tabulated data, much like a large Excel spreadsheet. If I were actually using Excel, I could freeze header rows and columns, and scroll the data around, always seeing what an individual cell refers to.
Is there any image viewer that lets me do this -- freeze a certain number of rows and columns of pixels and scan around the rest of the image? (I can think of other nifty features that'd be useful for such a thing, but this is my primary need).
(My preference would be something that runs under OS X 10.10, but that isn't a requirement. Free/open-source is also nice, but not required.)