Select the Single Row Marquee Tool. You can find this in the toolbar and it may be hidden in the rectangular or elliptical marquee tool.
Step 6
You can choose either the single line horizontal or vertical marquee tool depending on your preference. I chose the horizontal one. Create a selection where you want the pixel stretch to begin. It is good to pick a spot somewhere near the middle or near your subject.
Step 7
Now press Ctrl+T or go to Edit> Transform> Scale to use the Transform tool. With this tool, stretch the selection until it fills the image with a pixel stretch effect. Here's what mine looked like after doing this step:
Step 8
Now we're going to make it blend in. First, we'll add a layer mask. Select the middle layer and then go to Layer> New Adjustment Layer> Reveal All.
Learn how to use create an infinite number of white balance cards and print them out instead of spending $45 or more for a set of white balance cards...