What is the photo sharpening method used in Preview?

When looking at an image in Preview, under Tools -> Adjust Color, there is an option for sharpening. Does anybody know what sharpening method/ algorithm is used, and is it based on one of the several sharpening methods used in, e.g. Photoshop?
Thanks,
Richard

Hi,
It supports up to 16Gb as mentioned on page #4 of the third manual of the follong link
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&lc=en&product=5344330
Regards.
BH
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Message was edited by: kennethfromtoronto

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