4.

OK, if you did it right, you now have two different Smart Object layers. The top layer is a tad darker than the bottom layer. But the top layer completely covers and obscures the bottom layer. What you want to do now is blend these two layers together, so that the top layer doesn't interfere with the darkest areas on the bottom layer.

To do that, in the layer panel, double-click exactly under the name of the top layer. You'll see a new dialog window opening, the Layer Style window. At the bottom of this window, you find the Blend if section. Look at the This Layer slider.

Important: hold down the Alt key (or Option on Mac) as you click and hold on the small black triangle at the left side of the This Layer slider. The triangle will divide into two even smaller triangles. Alt-drag the rightmost small black triangle all the way to the right under the white triangles.

Click OK. You have now blended the two layers together!

We do not see things as they are. ǝɹɐ ǝʍ sɐ sƃuıɥʇ ǝǝs ǝʍ