Tuesday, January 23rd, 2018

Motion Tracking with After Effects – Adobe MAX 2009

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I’ve developed some projects for a hands-on lab session that I’m doing for two days at Adobe MAX 2009 in LA on Oct. 11 & 12. You can register for Adobe MAX by clicking here:

Here’s a sample of one of the projects I’ll be taking you through at the Adobe MAX sessions this year:

Motion Tracking with Green Screen & Reflections
*Note: This is an advanced project so previous knowledge of After Effects CS4 is required.

There are several factors in this project that we will be dealing with:
• Motion Tracking and placement of the screen’s video content
• Keying out the green screen to insert the video content
• Retaining reflections and motion blur of the right finger as it touches the screen

Starting with the “green screen” iPhone footage in After Effects, I’ve added another sub-comp of the contents I want to animate on the screen, as a layer in the same composition as the iPhone footage and scale it to the same size as the comp window. This is how the corner pin data will work once it’s tracked to the screen of the iPhone. If it isn’t the same size/scale, then it wont’ pin correctly.

I then open open Mocha for AE and import the iPhone footage to tack. Applying the spline tool around the entire outside of the iPhone as this will give us as much data as possible since the hands and fingers obscure the screen at points in the video. I then set the surface corner points to the four corners of the green screen on the iPhone and make adjustments along the timeline for each corner pin to assure it’s proper placement.

Adjusting the corner pin points in Mocha
Adjusting the corner pin points in Mocha

Once I’ve completed all the tracking point adjustments, I copy/paste the tracking data to the insert footage (the sub-comp layer in this case), taking care to be sure that the Timline Indicator is set at frame zero (0) before pasting the data. This assures proper alignment in time. A few adjustments to the anchor point of this layer will help align it perfectly into position.

Pasting the tracking data to the insert footage layer and positioning the Anchor point
Pasting the tracking data to the insert footage layer and positioning the Anchor point

I move the insert footage (sub-comp) layer to the bottom in the Timeline window so it will be visible when we key-out the green screen on the iPhone. I use Keylight in After Effects to select the green on the iPhone and create a mask.

Applying Keylight to the green screen on the iPhone
Applying Keylight to the green screen on the iPhone

It requires a lot of finesse to tweak the adjustments of the mask to allow for the shadows and reflections to properly show though the final composition; working with the edge color and foreground color adjustments as well.

Adjusting the mask controls to retain reflection details
Adjusting the mask controls to retain reflection details

After a lot of tweaking with the Keylight controls and applying some Levels, Hue/Saturation and Gaussian Blur to soften it up a bit, the final composite has a realistic look to it – retaining the original reflections on the iPhone screen.

The final composite retains the original reflections on the iPhone screen
The final composite retains the original reflections on the iPhone screen

Click below to view the final video of the composite:

Be sure to check out Adobe MAX 2009! Hope to see you there!

Jeff

Comments

3 Responses to “Motion Tracking with After Effects – Adobe MAX 2009”
  1. faton says:

    powerfull ever adobe

  2. Jeff says:

    Yes indeed – did you attend my session at Adobe MAX this year?

    Thanks, Jeff

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