USM Question

I know how to use unsharp mask, and have read some tutorials on it, but can someone explain what each of those three variable mean/do? I'd like to understand what each one does, so I'm not just reading something and programing numbers in.

Thanks for the help,
Byron

Here is a quite good tutorial. Here is another one.

Might help.

René Damkot wrote in post #3100418
Here is a quite good tutorial. Here is another one.

Might help.

Thankyou to both of you - that is a fascinating read, and it all makes sense now!

haha that was a good link, thanks Rene, makes more sense now.

Ron Bigelow has an excellent series of articles on sharpening in his articles section here:
http://www.ronbigelow.​com/index.html

Just marking this post for reading later. Thanks for the links.