Here’s how to easily combine two nightscapes into a single, stunning composite image!
The next time there is a new moon and you can get totally away from city lights, do the following. Make two separate images: one with a 20 or 30 second exposure and the second with 2 to 3 minute exposure. The first one will have the sky well-exposed with minimal star streaking, but the foreground will likely be pretty dark (below, left/top). The second one should have the foreground nicely exposed by the sky will be badly over-exposed with egregious star streaking (below, right/bottom).
Next, open both images in Photoshop, and copy and paste the shorter exposure time image on top of the longer exposure time image, as shown below (1). Then after clicking on the top layer, create a layer mask (2). Using the brush tool (3), with a black foreground color selected (4) adjust the settings as shown in (5) below.
Next, use the brush tool to paint over the areas of the top image you wish to remove. You can see how I did this below, where I have also switched off the bottom layer’s visibility so you can see which parts of the top layer I have removed and to what extent:
After a little final editing, here is the final result! Easy, right? Give it a try and let us know how it goes!!
-BPSOP Instructor: Mike Shaw
Mike Teaches:
Star Trails & Night Photography