Why is an "original" iPhoto export poorer quality than my original photo?!

Hi Everyone,
I hope you're all well. I had a question regarding iPhoto - I have an SLR which takes really good quality pictures, and I wanted to back them up in more than one location. I already have them in my iPhoto library - however, when I tried to export them with the "Original" option on File Export, and compared the exported version to the ones in iPhoto, its poorer quality than the one in iPhoto! Even though I selected "Original" quality!! However, when I exported it using PNG, it was exactly like the photos imported in to iPhoto. I understand that PNG is a lossless file format, but I am very confused as to why exporting photos in its original format gives a worse quality picture!
Would someone please be able to explain what is going on, and why the original export is much worse than PNG?
Thank you for your time!
Regards

How are you determining that the export is "much worse" than the imported photo
What format are you shooting on the DSLR (I assume it is digital)? What format are you exporting?
For what it is worth I do two daily backups (Time Machine running hourly and a daily bootable clone of my entier system) and I dod an occasional off site backup and I use three 32 GB level 10 SD cards so even shooting 16 MP RAW I only rotate back to the oldest card about once a year giving me a year's originals in addito=ion to my other backups
LN

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