Image resolution after cropping

When I zoom in on a 4 megapixel image the screen shows an image with acceptable resolution. If I crop to an image the size of the one showing in the unconstrained mode the image resolution drops dramatically. How can I crop and not loose so much resolution? I've been able to do much better with editing in Elements and then importing the image back into iphoto.
ibook G4   Mac OS X (10.3.3)  

ih2006:
Welcome to the Apple Discussions. Even though the dpi has changed from what it came out of the camera to 72, the resolution has not changed. It's just a different way of expressing the total number of pixels and the size to be printed. It's just math.
A 1600 x 1200 image at 300 dpi will print a 1600/300" x 1200/300" print (you do the math). That same image at 72 dpi will produce a print that is 300/72 times larger. The number of pixels, 1600 x 1200 hasn't changed, just the size to be printed. iPhoto changes it to 72. I've checked files with Photoshop, imported to iPhoto, exported and rechecked and the dpi has dropped whereas the print size has increased.

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