Isolating the LandThe next step is to mask out the Land Clouds with our Land Mask channel. This will restrict the clouds layer to only the areas of your map which are land. The rest of the areas will become transparent. Create a new black layer (set the fill type to Foreground Color and make sure your foreground color is set to Black) named “Land” and move it to just below the Land Clouds layer. This Land layer is really just a flat black background under your Land. Next, un-hide the Land Clouds layer and then right click on it to add your Land Mask.
Layer > New Layer > Black (Name “Land”)
Layer (Land) > Lower Layer (to just below “Land Clouds” layer)
Layer (Land Clouds)> Unhide
Right Click on Land Clouds layer > Add Layer Mask > Channel (Land Mask)
|Land Clouds Layer|
Colors > Brightness-Contrast > Contrast -25