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5

While chroma-keying is a good technique for dealing with solids, it doesn't work so well when dealing with transparent or semi-transparent objects. Because the difference can be very subtle, you want to copy the difference instead or blend off luminance. In Premiere, you can use the Set Matte effect to set a track as a luminance matte. In the case of the ...


4

First off, you would normally use After Effects for special effects such as Chroma Keying. That being said, Premiere Pro is capable of chroma keying quite decently. Here's an example using free smoke effects by JohnnyFXEffects. Set up your scene as you usually would, and then go to the 'Effects' tab. (1) From the 'Keying' folder, select the 'Chroma Key' ...


3

Assuming the lighting is solid, you should be in good shape. I haven't used the keying features of iMovie, but I can give you a few tips for After Effects. I'll defer to any power users of AE's keying functionality to chime in with more specific advice. First, you'll probably want to start with the Keylight plugin (from The Foundry). It should come bundled ...


2

The simplest way would be to set the blending mode of the smoke clip to "screen". You'll find this setting in the "Effect Controls" panel under Opacity. Screen basically ignores black. A better description is found on Adobe's site: http://helpx.adobe.com/en/photoshop/using/blending-modes.html


2

Most likely, they are simply using an output of the notes with transparency. If you output the digital version of the notes with a transparent background you could just layer it over the video once properly aligned and it would work fine. Alternately, a quicker process if they do not support alpha is to just apply a blend between the layers. Since the ...


2

There isn't a right or wrong answer here I don't think. Both approaches have advantages. Keying at 1080p will give you clearer detail when trying to find edges, but also will have more noise that could throw off a key. Additionally, the downscale after the key will apply a slight blur to the image further disguising the edges to make the keying less ...


2

This is quite simple. Use any keyer of your choice that can give you a good mask for the layer, then place an "Alpha Adjust" layer below it in the Effects control and click the "Invert Alpha" checkbox. This will invert the alpha channel produced by the keyer and reverse the effect the way you are looking for.


1

What you're looking for is a difference matte. (Not to be confused with a Color Difference Key which is similar to regular chroma key.) It can certainly be done, though you should know that difference mattes are fairly temperamental. The way it works is by finding the difference between an image and each frame of video, and removing anything that's the ...


1

Everything that Filzilla said is great and on point. BUT the standard chromakey plugin that comes with Vegas is lacking. There really is no way to get around it. I have been doing greenscreen videos for yourmusicmuse.com for 3 years and I have found the NewBlue ChromaKey Pro plugin is perfect. It has the following features: Garbage mask to mask out bad ...


1

While not a direct solution, AVISynth supports creating a mask from a Chroma key using ColorKeyMask. You can then use that mask to blend the two layers together by using Mask on the top layer and then Layering them together. You could then just feed files in to the script and use FFMPEG or something similar to write out the frame stream from AVISynth. ...


1

What with the felt-tip pen and the transparency of the writing surface, this actually looks more like they're writing on a transparent whiteboard. Probably perspex, or plexiglass. This type:



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