Mr. Squirrel came to visit my bird feeder this morning, and I got his picture, hoping to use it for the "Rule of Thirds" thread. (I have the squirrel on the intersection of one of the "lines" for the rule of thirds, but if I crop it it'll be better.)
Anyway, I was shooting thru the window
and screen
and it was so cloudy I had to bump up my ISO to 400, so the shot isn't that great:
So I decided to play around in Photoshop Elements 4 to see if I could make it any better (why clean the house when I can mess around with my pictures, right?

). I've seen posts where someone will say that they "sharpened" their photo, but I've never used sharpening or unsharp mask, so I decided to give it a try, and viola!
(I even cloned out the bird dropping on the fence behind the squirrel, too.)
My question: I achieved this result using the Unsharp Mask filter. Using the sharpen tool only made the photo granier, didn't "sharpen" the photo at all. So why is it called an "
Unsharp Mask" filter when it makes details
sharper?

And why would I ever want to use the Sharpen tool when it only adds grain to a photo? Can somebody show me an example?
Thanks!
(See, that's the whole problem with this Photography Board - the more I learn, the more questions I have!)