- a digital camera
- a large mirror, preferably without a frame
- a decent photo editing app
Step 1: Set Up the Shot
The ideal mirror would be a front-surface mirror, preferably not bolted to a wall.
Step 2: Take the Picture
Try to get the edge of the mirror vertical in the shot. If you don't, you'll need to fix it in editing.
In this case, the mirror is on the right-hand side of the camera. Everything on the right side of the image is a reflection. I'm the scruffy guy standing in the doorway.
Step 3: Edit the Image
Flip the reflected side of the image so that you end up with a reflection of the reflection.
Crop out any extraneous bits, like the edge of the mirror.
Scale the image down so that it's about 5" wide on the screen. Something around 400 pixels is probably a good size.
That's about it. Chances are the reflected side of the image is a bit blurry and maybe a little distorted but it won't make that much difference.