Unsharp Mask

Unsharp Mask (USM) is the classic Photoshop sharpening tool. Remember that it is not always easy to judge the effects of sharpening accurately on a monitor. An image that appears hopelessly oversharpened on a monitor can look ideal when printed on an inkjet printer.

The main types of artifacts caused by sharpening should be kept to a minimum:

► Halo effects (black or white lines at object edges)

► Image noise (amplified by sharpening)

There are a great number of sharpening tools available, and it is up to you to decide which is the best for you with regard to functionality and your wallet.** ** See also section 12.4, page 477).

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