Aperture photo file size

I'm working on some scanned images I imported into Aperture some time ago.  I have two instances of the exact same image - the pixel dimensions are identical (4960 x 3596  17.3MP).  But one has a File Size = 16MB and the other has a File Size = 99MB. The only difference I can see is that the 16MB file carries a file type suffix of .TIF and  the 99MB file has a suffix of .tiff.
Any ideas about what is going on here?

In my experience, the Tiff that Aperture will create to send to the external editor -- in my case Photoshop CS5 -- has the .tiff extension.  Do you have Photoshop or Photoshop Elements?  If you do, and the edited file were returned with layes, it would not be unusual at all to see this size.  With the image with large file, do an Export Master to the desktop, and with PS, or other editor, check to see if it has layers.
Btw, the ones I scan with my Epson 4870 have only a .tif extension.
Ernie
Message was edited by: Ernie Stamper

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