Why is iphoto compressing my 300 dpi pics to 72 dpi after I have made edits?

why is iphoto compressing my 300 dpi pics to 72 dpi after I have made edits like color correction?

It is not compressing your photos other than normal JPEG cpompression
DPI is meaningless without inches (Dots per Inch) which digital photos do not have
There is a field in the EXIF data that records a DPI but it is meaningless - basically it says that this photos was displayed on a computer screen which is a 72 DPI device
The photo is exactly the same dimensions and resolution as before editing (unless you cropped it)
See  The Myth of DPI for additional information.
LN

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