Follow the Luma Key mat vs Alpha

I was hitting my head on the wall of Google for hours now with no real answer (but a very real headache): what exactly is the difference between Alpha Matte and Matte Luma in the mast first elements Track key?

The best I can find something like "The Alpha matte uses the alpha channel for the matte", is that (and more to resemble each response peer review I ever wrote) doesn't really help because, uh, what the! $@ # is an alpha channel? Even the "Photoshop for Dummies" lost me.

All that I know is that when I create a white circle using the titration to PRE module, it seems the same behavior (rightly) if I have Alpha or Luma chosen.

When I create a white circle on a black background in PSE, it behaves (rightly) if I choose Luma, but if I choose Alpha matte is treated as if it was 100% black or white to 100%, although this is clearly a white circle on a black background.

So, what gives?

  • Is it because the titration module has transparent backgrounds, while my PES has a black background?

  • Or is my image PSE missing this mysterious Alpha channel, and if so how to add?

  • Are associated with transparency and alpha channel?

  • Or is the simplest rule just to create a black and white image in PSE and choose luminance?

[Hunt: I'll understand such things matte, if it kills us!] ]

It's simpler than that, Ed.

Luma founded the matte on colors, i.e., white sets the matte (transparent through your clip) and black opacity.

Alpha based on transparency matte matte image. In other words, if you have a white circle, the white circle sets the matte and the area around the white circle (which is transparent, unless you color) sets the opacity.

Tags: Premiere

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