Unexpected reduction in file size for photos rotated on my camera.

Hello,
This seems a bit weird and wondering if anyone has an idea on why this is happening.
I take my photo on my camera and then rotate it within the camera to the proper orinetation.
Import the photos into iphoto and automatically it places the origional 4MB file in the origionals folder and then in the modified folder it places a copy about 2MB in size.
If I control click I an revert the 2MB back to the full 4MB version, but wonder why is iPhoto doing this?
Thanks in advance for any help and assistance.
Cheers,
harley2g

Harley:
You camera has an auto-rotate option that creates a tag telling other applications that the image needs to be rotated for proper viewing. iPhoto automatically reads that tag and creates a rotated version as saves it in its Modified folder. It's the same as any edit. If you look closely you'll find that after a short time iPhoto will recreate the rotated version.
One problem encountered with that is when you send the photo to another application from iPhoto and that application does not read the rotate tag it will appear back in the unrotated orientation.
The only way to avoid the modified file and get the file to be orientated correctly is to rotate it before you import into the library. If you turn off the auto-rotate in the camera and the rotate before importing into iPhoto all future applications of that image will appear correctly orientated.

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