To create a 3D landscape you have to open Photoshop first and go to File and press ”Open”. Open the photo you want to have a 3D landscape.
Then choose the ”Quick selection tool” and select the part of the photo you want to create a layer for. Do not forget to duplicate the background layer.
After selecting the part of the landscape, press ”Select and Mask” at the top.
On the left side of the computer change the smooth (18), feather( 0.3px), contrast (20%) and the shift edge (4%) and press OK.
Then press ”cmd + x” and create a new layer. After creating a new layer, press ”shift + cmd + v”.
Do the same to create the other layer as well for the bottom side of the picture.
These are my final layers
That will create your layers which will be needed for the second phase in Adobe After Effects.