What Is Unsharp Mask in Epson Scan?

Unsharp masking (USM) is an image sharpening technique, often available in digital image processing software. ... The unsharp mask is then combined with the original positive image, creating an image that is less blurry than the original.

What does the unsharp mask filter do?

Unsharp masking, or USM, is a traditional film-compositing technique used to sharpen edges in an image. The Unsharp Mask filter corrects blurring introduced during photographing, scanning, resampling, or printing.

Should you use unsharp mask when scanning?

So it is best to apply unsharp masking last, after you have adjusted the picture's gamma, removed any color casts, or otherwise cleaned up the image. If you want to produce high-quality images, you should use a robust image-editing program that offers meaningful controls as part of its unsharp masking filter.