Unclicking Resample Image will cause Width, Height and Resolution to remain proportionally the same. So a 72 dpi image that is 15.667 inches wide will be 5.64 inches wide if you change the Resolution to 200. Basically, it is not changing your file size in the slightest, only the output size. Click on Resample Image when you actually want to downsize the file, ie. for the web.

Kort Kramer - Kramer Kreations