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Is there a quick way we can mask a layer according to the alpha or luma information from the layer above in Adobe After Effects? Introducing Luma and Alpha track mattes! In this video we'll be breaking down how you can use them and exactly what the difference is between the two!
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✅ VIDEO SUMMARY
To apply either a Alpha or Luma track matte to one of your layers, first make sure you have another layer (which will contain the mask information) positioned higher in the hierarchy. Track mattes will either use the alpha information from this layer to create a matte on the layer below, or the luma information (luminosity). For the luma information, in the first version it will use the brightest areas of your image to include in the mask and it will discard the darker areas (vise versa in the inverted version). The alpha channel relies on the actual shape and dimensions of the layer above and discards any "negative space" (visa versa in the inverted again).
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🕒 TIMESTAMPS
0:00 What are track mattes?
2:27 How to use the alpha track matte
4:19 Reverse the alpha track matte
5:25 What is the luma track matte?
7:40 Invert the luma track matte
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What Are ALPHA And LUMA Track Mattes in After Effects?
Теги
What Are Alpha And Luma Track Mattes In After Effects 2021?How do you make mattes in After Effects?How do you use alpha mattes in After Effects?Where is alpha matte in After Effects?What is alpha matte?Where is track matte in After Effects 2021?Where is track matte in After Effects 2022?What is a matte key?How do you put a track matte on?What is Alpha and Luma?What is a Luma track matte?How do you reverse track matte in After Effects?What is a matte?