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Removing black or white from layer/footage, deMult/unMult

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Here are two presets knocking out black OR white from a layer based on the luminance to set it as transparent/alpha.
After Effects 7
Keying
Presets (ffx)

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The "deMult_black" is a common way to knock out the blacks.
Apply it in order:
1. "Levels" to crush the blacks(optional)
2. "Shift Channels" and set the alpha to luminance
3. "Remove color matting" to get rid of the rest of the blacks on the edges

The "deMult_white" uses the same techinque, but incl. a double invert.
Apply it in order:
1. "Levels" to crush the whites(optional)
2. "Invert"
3. "Shift Channels" and set the alpha to luminance
4. "Remove color matting" to get rid of the rest of the blacks on the edges
5. "Invert 2"


Effects & Plugins

Levels, Shift Channels, Remove color matting, Invert

(Min. Version: After Effects 7, Category: Keying, Type: Presets (ffx))
posted by mmo on Feb 03, 2009

 

Related topics:

Remove Color Matting

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In this podcast tutorial, Creative Cow leader Aharon Rabinowitz adds to the concepts he covered in his tutorial Straight Vs. Premultiplied.
After Effects 7
Keying
Video-/Tutorials

Views: 2324
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posted by MaxX on Jan 31, 2009

Motionworks Effects A-Z: Alpha Levels

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Have you ever looked in the Adobe After Effects Effects menu and wondered what some effects are used for?
This time: Alpha Levels
After Effects CS3
Useful things
Video-/Tutorials

Views: 3099
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posted by MicGyver on Aug 15, 2009

Motionworks Effects A-Z: Auto Effects

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Have you ever looked in the Adobe After Effects Effects menu and wondered what some effects are used for?
This time: Auto Color, Auto Contrast and Auto Levels
After Effects CS3
Useful things
Video-/Tutorials

Views: 4130
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posted by MicGyver on Sep 13, 2009


 

 

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