Roger's points were all good, and indeed, Photoshop doesn't do "real"
unsharp masking. The unsharp mask in Photoshop does a form of selective edge
enhancement, making the light pixels along an edge slightly lighter, and the
dark pixels slightly darker.
Here's a good approximation of "real" unsharp masking:
http://www.astropix.com/HTML/J_DIGIT/USM.HTM
---
Scott Gomez
-----Original Message-----
From: Henrik Dahl [mailto:hdahl@xxxxxxxxxxxxxxxx]
Subject: Re: [OM] Digital question; when does touch-up become cheating?
What exactly does the unsharp mask do to "restore original appearance"?
Doesn't it make the picture, eh well... unsharp?
Henrik Dahl
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