I have a directory of JPEG's. Each one is roughly 90k, as reported by Photoshop when saving, and also reported by the command line function 'ls'.. When I get the properties for the file with Finder, it's double that, over 220k. Zipping it with finder will also package this bulk as well. Doing the "zip -v test.zip ./dir" command will make a MUCH smaller zip file.

Zipping the files on windows also results in a much smaller file size as well, roughly the same to that of the unix zip command. File sizes are also reported correctly on windows. I can't find any mention of this anywhere, so I'm asking here.