Question: I can only compress files to PDFs, no matter what the original format is, but I can decompress back to –say- jpeg, exactly how it was before, right? I plan to compress a whole bunch of older projects. So if anyone ever asks what happened to the pictures I can decompress them back to jpeg, tiff or whatever the original format was, correct?

Answer: Yes the software compresses to PDF only, but decompresses to all the other formats as well.