some maps when scanned into jpg are absolutely huge. 50-100 mb each. a file of that size moves very slowly because the program is trying to render the entire document. What software exists to view such huge jpg/tiff files in a quick manner?

I am intersted in both mac and pc versions of software.

David
thanks for answer, yes i have plenty of programs that open graphic files. I am looking for programs like MrSid Viewer (i used to have it as a stand alone app many moons ago) it basically allows incredible speed navigating these 50mb files.