Preview always pastes in 72 dpi

Hi,
I have a large map scanned at 250 dpi. If I open it in Preview and copy a portion of it and then use File ->"New from clipboard" it will paste the image always in 72 dpi and I want to paste it at the original dpi of the copy, ie:250 dpi.
If I open the original map of 250 dpi in photoshop, copy a portion and paste it from the clipboard it respects the original 250dpi. So whay does preview paste an image at 72 dpi?
Message was edited by: PerseP

Actually, the 72dpi conversion is taking place on the copy, not the paste. Also, the resolution is still at the original settings, but at 72dpi. Either way, that is odd. Overall, however, does it really matter that the resolution is being dropped to 72dpi? The quality is still there?

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