Page 102 - Photoshop for Lightroom Users – Scott Kelby 2nd Edition

Step Three:
In the Layers panel, click on the top layer to make it the active layer, then click where that Eye icon used to be (to the left of the layer’s thumbnail) to make
it visible again. Then, go under the Image menu and choose Apply Image. When the Apply Image dialog appears, you’re going to input a few settings that
you need for this technique. I would explain these in detail if I only understood them, but here’s what I do know: they work, so use these settings. From the
Layer pop-up menu, choose Layer 1; from the Blending pop-up menu, choose Subtract; for Scale choose 2; for Offset chose 128; and then click OK. Your
layer should look gray with a blurry version of your image (as seen here).