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?

It supports up to 16Gb as mentioned on page #4 of the third manual of the follong link
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    Message was edited by: kennethfromtoronto

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