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DPChallenge Forums >> Tips, Tricks, and Q&A >> USM
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Showing posts 1 - 9 of 9, (reverse)
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 10/18/2005 03:34:46 PM · #1
I am not sure what this means when it comes to photoediting. I know what USM for canon lenses are but what does it mean in editing?
10/18/2005 03:36:36 PM · #2
Unsharp Mask in Photoshop
 10/18/2005 03:38:28 PM · #3
and what does it do?
10/18/2005 03:38:59 PM · #4
The Unsharp Mask filter in editing software sharpens your images. Yeah - strange I know!
 10/18/2005 03:40:54 PM · #5
The most recent lesson in the Photoshop Basics Thread deals with USM and how it works. It's a bare-bones overview.

Robt.
 10/18/2005 03:44:33 PM · #6
A couple threads on this:
Sharpening question
Sharpening question?
10/18/2005 03:47:46 PM · #7
Originally posted by joezl:
The Unsharp Mask filter in editing software sharpens your images. Yeah - strange I know!


I read an explanation once that the mask it creates masks out the unsharp areas of an image, hence the name Unsharp Mask. It helped it make more sense to me. :)
 10/18/2005 03:54:27 PM · #8
Originally posted by laurielblack:
Originally posted by joezl:
The Unsharp Mask filter in editing software sharpens your images. Yeah - strange I know!


I read an explanation once that the mask it creates masks out the unsharp areas of an image, hence the name Unsharp Mask. It helped it make more sense to me. :)


Basically USM creates an invisible layer of gaussian blur and compares that to the original image to detect edges. When you set "radius" on USM you're actually setting the gaussian blur radius and altering what the filter considers to be an "edge". That's the "unsharp" part of USM. Probably means the same thing as what you just said :-)

R.
 10/18/2005 04:16:14 PM · #9
I found this to be a helpful tutorial:

DPC Tutorial
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