Converting images into PDF files

Hello MacRumors people! I have a bit of a problem. I was wondering if there was an easy way to take a very long image, and convert it to a several page PDF file. I have Dragoman, which converts PNG files to PDFs, although it keeps it as one page. I would like it to automatically split the long image into several pages. Is there any way of doing this short of editing the image and exporting each page length section separately? If there isn't a Mac program, is there a Windows program that can do it? I have Parallels too, but either way I would like to know. Thanks for the help in advance!