Page 131 - Photoshop for Lightroom Users – Scott Kelby 2nd Edition

Step 13:
You’re going to go to the Layers panel again, but this time you’re going to go up near the top right and lower the Opacity setting for this blue layer until it
starts to bring back some of the original color, but with a blue tint on top that better matches the background scene. Here, I lowered it to 42% and now it’s a
much better match (as seen here). Then, we’re going to create a new layer on the top of the layer stack that looks like we flattened the image (took away all
the layers). That will allow us to apply an effect to the entire image (instead of just applying it to our current layer). To do this, press Command-Option-
Shift-E (PC: Ctrl-Alt-Shift-E), and it creates a new layer at the top of the layer stack that looks like the flattened image (as seen here on the bottom right).
Now we’re set up for our next step.