In this Photoshop photo effects tutorial, we're  going to learn how to easily add a realistic water reflection to any  photo. It's a very easy effect to create and you can add it to any photo  you like, although it tends to work best with images that don't already  contain water in them.
We'll be using a simple filter and a displacement map to  create the water ripple effect, and a Hue/Saturation adjustment layer to  give our water a little color.
Here's the photo that I'll be working with throughout this tutorial:
And here's what our image is going to look like after adding the water reflection :
The final result.
Step 1: Duplicate The Background Layer
With our image newly opened inside Photoshop, we can see in  the Layers palette that we currently have one layer, the Background  layer, which contains our image:
 
           The original image on the Background layer in the Layers palette. 
We need to duplicate the Background layer, and we can do that using the keyboard shortcut 
Ctrl+J (Win) / 
Command+J  (Mac). Now when I look in my Layers palette now, I can see that I now  have two layers - my original Background layer on the bottom and a new  layer, "Layer 1", above it which is my duplicate:
 
Press "Ctrl+J" (Win) / "Command+J" (Mac) to duplicate the Background layer. 
Step 2: Add More Canvas Space To The Bottom Of The Document
We're going to add our water reflection below the image, so  let's add some canvas space to the bottom of our document to make room  for our reflection. To do that, go up to the 
Image menu at the top of the screen and choose 
Canvas Size.  This will bring up Photoshop's "Canvas Size" dialog box. The easiest  thing to do here is to add twice as much canvas space as what we  currently have, but we only want it to appear at the bottom of the  document, not above it or on either side, so we need to tell Photoshop  exactly where we want this extra canvas space to go.
First, enter 
100 for the 
Height and set the measurement to 
percent, as circled in red below. Leave the Width option set to 0. Then make sure the 
Relative  option is checked, which tells Photoshop to give us 100% more canvas  space than what we already have. Below the "Relative" option is a 3x3  grid of squares. This is where we tell Photoshop where we want to place  our additional canvas space. Click inside the square in the middle of  the top row (again as circled below). This tells Photoshop not to place  any of the extra canvas space above the document and instead to place  all of it at the bottom:
 
Add more canvas space using the "Canvas Size" dialog box. 
Click OK to exit out of the dialog box, and Photoshop will add the extra canvas space to the bottom of the image:

 x           
The height of the document has now been doubled with the extra canvas space added to the bottoM
 
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