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How to create an alternate reality mirror in After Effects

Nov 27, 2017 by John Aldred Add Comment

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This is one of those classic movie effects, especially in horror movies. There’s your soon-to-be victim, looking at themselves in the mirror. They finish what they’re doing, turn to walk away, and the reflection stays there, with a stupid evil grin on its face. It’s a cool effect and one that’s very easy to do in After Effects or Premiere as this video from Ian Sansavera of Learn How To Edit Stuff shows.

The same effect can also be achieved quite easily in Premiere Pro, too. Ian just prefers the way it looks in After Effects. The technique can be translated over to Premiere quite easily, though. It’s a pretty straightforward technique, that only really requires a few steps.

  1. Set your camera up on a tripod, and record both sequences in one long take
  2. Bring the clip into After Effects and cut it into two, layering one on top of the other
  3. Animate a mask separating the two layers so that one clip shows the subject on this side of the mirror and the other shows the reflection
  4. Simulate some handheld camera movement to sell the effect

The first one is the difficult bit. You might think to record this in two separate clips, as you need two clips in AE. But Ian recommends recording it in one big long take. This way, there’s no risk of your camera moving slightly between takes as you hit the record button. It’s easy to chop up a clip in post.

But what’s difficult about it is getting your timing perfect. You have to repeat every move exactly, right up until the point where you want things to change. Getting the timing perfect at the beginning is the key to surprising the viewer.

With the two clips masked off, the finishing touch is to simply add some camera shake. With After Effects, you can use the wiggle function, if you wish. But, for a more realistic handheld motion, Ian has another tip.

Simply stick a small piece of tape to a clean wall, and then film it handheld for a minute or so. Then motion track the footage, and apply that motion to your final mirror shot. Then you have genuine handheld camera movement.

A simple technique with convincing results. As long as you can get your timing right.

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Filed Under: Tutorials Tagged With: after effects, compositing, Ian Sansavera, Learn How To Edit Stuff, visual effects

John Aldred: from diyphotography.net

About John Aldred

John Aldred is a photographer with over 20 years of experience in the portrait and commercial worlds. He is based in Scotland and has been an early adopter - and occasional beta tester - of almost every digital imaging technology in that time. As well as his creative visual work, John uses 3D printing, electronics and programming to create his own photography and filmmaking tools and consults for a number of brands across the industry.

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