Page 181 - Photoshop for Lightroom Users – Scott Kelby 2nd Edition

Step Seven:
Since we now have four different image layers that we can work with, let’s see what happens when we tweak the sliders. With the top layer still active, I
dragged the half of the bottom-left slider that I had dragged to the right back to the left a bit (as shown here), then I dragged the half of the top-right slider
back over to the right, and then I split-and-dragged the top-left slider way over to the right—just experimenting and seeing what looks good. In this case,
tweaking the sliders brought back some of the yellow paper texture.