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Step 4 – Prepare the layer for the displacement map
To distort the image behind the glass, we’ll be using the displace filter. Before we can use the displace filter, we have to create a displacement map which will tell the displace filter how to distort the image. First, we’ll prepare a new layer to create the displacement map on. Select the top layer then press Ctrl+J or select Layer > Duplicate to duplicate the layer.
If you are using Photoshop CS2 or newer, your layer should be a smart layer. You can tell if it’s a smart layer by looking for the 
icon on the bottom right corner of the the layer thumbnail. If your layer is a smart layer, right click on the layer then choose Rasterize Layer. You can also access this from the Layers > Rasterize > Layer menu item.
Now that your layer is rasterized, you won’t see the icon in the layer thumbnail. And because it is rasterized, we can apply filters and adjustments that aren’t available for smart layers.
Step 5 – Create the displacement map
First we’ll use the levels tool to add contrast to the layer. With the top layer selected, press Ctrl+L or choose Image > Adjustments > Levels to access the levels tool. In the levels tool, drag the black input slider towards the right to increase the contrast until the background is black like the image below.
Now we are going to use the emboss filter to turn it into a displacement map that can be used with Photoshop’s displace filter. Choose Filter > Stylize > Emboss and use the settings as shown in the image below.
Here’s what the displacement map looks like:
Step 6 – Clean the displacement map
The displacement map looks great so far, but there are many errors on it. Shown in the image below is one of those areas where the bump map created a bump for a smudge that isn’t a bump on the glass. In this step, we’ll clean up those areas.
Start by changing the blending mode of the displacement map layer to overlay. This will let you see both the displacement map and the layers behind it and give you a slight preview of what the results will look like.
Set the foreground color to a 50% gray. Start by clicking on the foreground color in the tools palette. A color picker window will appear. Enter in 808080 in the # field to get a 50% gray.
Select the brush tool and paint over the areas that you want to remove the bumps from. The bumps in the areas you paint will be removed.
Here are the before and after results.
