JUMPING TO PHOTOSHOP how and when to do it - The Adobe Photoshop Lightroom 4 - page 306

Step Three:
Make two duplicates of the Background
layer by pressing Command-J (PC: Ctrl-J)
twice. Then go to the Layers panel and
click on the center layer (shown highlighted
here). Now go under the Filter menu, under
Sharpen, and choose Unsharp Mask . This
is a low-resolution image we're working
on, so apply an Unsharp Mask with the
Amount set to 85%, the Radius set to
1 pixel, and the Threshold set to 4 levels,
and click OK to apply the sharpening.
( Note: If this had been a full-resolution
image from a digital camera, I would have
used Unsharp Mask settings of Amount:
120, Radius: 1, and Threshold: 3.)
Step Four:
Now, after the sharpening, you're going to
apply a huge blur to this image. So, click on
the top layer in the Layers panel (Layer 1
copy). Go under the Filter menu, under
Blur, choose Gaussian Blur , and enter 25
pixels as the Radius, so it's really blurry
(like you see here).