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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

There are a zillion greenscreen tutorials on YouTube. The basics are simple. 1.Pure green paint or fabric. 2.Even lighting on the green, good lighting technique on the subject. Avoid spills and shadows. 3.Use the highest quality camera, lenses and compression you have available -- but don't freak out unless you're using a lot of translucent objects like ...


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

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 might be an issue with the Vegas chroma key program removing green from all objects and making it transparent rather than finding only solid green and modifying that. Someone may know how to fix this in Vegas, but if all else fails you can run your keyed footage through a program like Davinci Resolve Lite (free) and correct the colors.


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

The problem is that my alpha Mask has a feather. Which results in greeen peaking through the Mask. So the only solutions are export an alpha mask with no feather or export the original image with a black or desaturated background.


1

Part of it may be the fact you are using JPEG sequences. JPEG isn't a pixel accurate format and you are going to have some differences in block quantization that could potentially result in mismatches. I don't think that is the only issue since it is a bit too regular for it to be the only issue, but I'd try to use an intermediate format that is a bit more ...


1

I would guess that it is trying to correct for green highlights in the chromakeyed video and overdoing it. It's relatively common for green screen footage to have greenish reflections due to light bouncing off the green wall back on to subjects. The chroma-key effect may be attempting to automatically correct this and catching objects that have no such ...


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

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. ...



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