Just imported a photo with 300 ppi. afterwards i changed it with iphoto. as i opened it agin with gimp it has only 72 dpi, Why?

I have done the following.
1 Bildscan with 300 dpi.
2. Import in Iphoto
3. with iPhoto i cutted out the part i needed
4. Edit with gimp to find out the actual DPI ==> result 72 dpi
My question
May I use this Phot in a Photobook? (apple recomends at least 300 dpi) How may I check the DPI count in Iphoto in order to be sure it complies the minimal requirements?
Best regards

It doesn't matter.
What matters is the total number of pixels in the image. Screen display defaults to 72 dpi. All that means is that the dimensions of the photo are bigger - longer x wider. The dpi is only set when you decide what size your print is going to be.
For example, if you have a 12 megapixel image: (4,000 x 3,000 pixels) and print that at 100 dpi, then it will be resulting print will be 40 inches by 30 inches (4,000/100 etc)
Print it at 300 dpi and it will 13.3 inches by 10 inches
etc
Regards
TD

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