- In this After Effects Hidden Gem,…I want to teach you how to use an expression…that would probably intimidate you at first,…but it's really useful:…it's the linear interpolation expression,…and what it does is convert any one range of numbers…into any other range of numbers.…It's a great way,…when you're trying to coordinate animations,…to make two different ranges,…such as rotation and, say, something like opacity…or tracking or blur amount,…line up to do what you want them to do.…Now, you might have seen this composition before.…We used it in the previous Hidden Gem,…when we were showing how to extract keyframes from audio.…
Here is our audio track,…(rhythmic techno music)…and to convert that into keyframes,…we go to Animation, Keyframe Assistant,…Convert Audio to Keyframes.…This creates a null object…with three expression controls attached:…one that has the left channel's volume,…one that has the right channel's volume,…and one that has both channels together.…I'll twirl these up, twirl up the waveform,…and focus just on the both-channels slider for now.…
Updated
6/7/2016Released
4/15/2015- Setting the vertex point
- Creating swarms of object
- Replacing layers without losing effects and animation
- Simplifying projects
- Hiding layers
- And more…
Skill Level Intermediate
Duration
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Introduction
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Welcome2m 1s
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Gems from June 2016
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Preserve transparency3m 56s
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Gems from May 2016
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Illustrator artboards7m 57s
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Retiming Sequences9m 13s
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Collapsed adjustment layers8m 18s
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Gems from April 2016
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Converting footage to comps2m 13s
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Gems from March 2016
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Divide mode4m 38s
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Difference mode4m 14s
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Adding comments to projects3m 46s
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Edit this; look at that4m 3s
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Tricks with keyframes3m 49s
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Gems from February 2016
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Smoother6m 7s
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Linear expression6m 58s
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Expression controls4m 50s
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3D camera shake5m 56s
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Gems from January 2016
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Puppet overlaps3m 7s
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Puppets and multiple shapes3m 39s
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Slip editing3m 50s
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Adobe Typekit3m 15s
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Gems from December 2015
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Hold keyframes7m 6s
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Color palettes5m 18s
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Comp proxies6m 23s
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Gems from November 2015
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Automatic fades4m 12s
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Wiggle behaviors6m 36s
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Layer styles6m 56s
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Roving keyframes7m 38s
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Gems from October 2015
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Pixel Motion Blur7m 46s
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Fading multiple layers5m 10s
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Basic behaviors6m 48s
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Gems from September 2015
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Wiggle Paths5m 36s
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Preserve Frame Rate6m 50s
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Stereo Mixer7m 38s
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Gems from August 2015
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Stopping previews3m 58s
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Swarming shapes6m 6s
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Revealing curved shapes9m 53s
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Write-on8m 44s
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Dashed lines4m 45s
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Gems from July 2015
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Cleaning up projects5m 49s
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Illuminating dark layers3m 58s
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Adjustment lights5m 53s
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Gems from June 2015
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Conform frame rate4m 16s
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Working color space5m 31s
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Grow Bounds3m 18s
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Replace source4m 39s
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Sequence layers7m 52s
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Gems from May 2015
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Temporary tools3m 34s
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Guide Layers2m 49s
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Set first vertex7m 34s
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Cropping on output5m 28s
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Gems from April 2015
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Alpha Add mode2m 29s
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Effects instancing3m 53s
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Video: Linear expression