In this tutorial, I'm going to show you how to take an image that was shot during the day, and make it look like it was shot at night. There are a couple ways of that you can achieve this look, but I will just be showing you one way that I most commonly use. We will be using various adjustment layers and blending techniques during this process. Now remind you, every piece will turn out differently, what I am showing you is just a starting point for your image. So keep playing around with the adjustment layers to achieve the effect that your looking for. Let's start out with the stock image:My Barn Is My Kastl by Burtn
First thing you want to do is make sure to duplicate the layer. I always duplicate whatever images I work with and create a folder called "Original Stocks" and keep them hidden there in case I mess up somewhere along the line.
Then what you want to do is start out by creating an adjustment layer (1) for Hue/Saturation (2). Turn the saturation level down just a little, because at night you don't really see such vibrant colors. Now we'll come back to the Hue/Saturation layer in a few seconds.
Next your going to create a Brightness/Contrast adjustment layer (3). Your going to drag the brightness to the left enough so that it's as dark as you would like it to be. Then your going to drag the contrast to the right to increase some of the lighter sections. As you can see, it brought back a little bit of the yellowness in the grass, so we are going to go back to the Hue/Saturation layer. You see where it says "Master", if you click that and click on "Yellows", (4 & 5) we will be decreasing the yellow coloring in the grass by taking the saturation and moving it to the left just a little bit.
So now your piece should be looking a little more darker like this:
You can deal with the sky two ways, one just replace it with a different image that is the night sky with stars and a moon, or you can take the sky how it currently is and make it darker on it's own (possibly add a moon later if you so choose). For simplicity (and to keep this tutorial shorter), I'm just going to replace the background. I just created a new layer and made it a very dark blue, and added some stars using a scattered brush texture for the sake of a quick job.
Now for the last step, there should be a little bit of moonlight right? This step is pretty simple. All you have to do is paint! Just take a very soft edge round brush in white, lower the opacity, and on a seperate layer just paint over areas that you think the moonlight would reach. This is the outcome I achieved!