Understanding USM

Sharpening is a critical part of a digital workflow. Having a good understanding the USM filter is essential to enable you to produce the best results possible.

An Introduction

If your picture is muzzy or blurred USM isn’t really going to help. If an image is out of focus, applying some sharpening to it can help improve the overall appearance, but it won’t make it a sharp image. The sharpening tools in Photoshop will not replace good technique. Firstly lets deal with why it is called unsharp mask and what its origins are; I am not old enough to remember the process being used in the commercial darkrooms that I have been involved with, but I know someone who does.

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