The key signal is actually more complex than that. The key signal appears as a black and white source and the fill signal looks like your content. You have to setup your switcher's keying settings to know which is the key and which is the fill signal, and then it handles processing the signal over your other sources.īefore we get into the setup of the alpha key, let's take a look at what's actually being sent for the key and fill signals.
For SDI, you are sending two physical connections.
For NDI, you are only making one connection and the receiving software processes the data and knows what to display. With an alpha key, you are providing a key and fill signal to your switcher. The difference with those types of keys and an alpha key is that they generally use a single video input and just remove a color. A true luminance key is usually only available on high-end switchers. You can do a chroma key with any solid color. Most switchers can also remove black and will call it a luminance (or luma) key, but it's actually just a chroma key, but using black instead of green. If you're familiar with seeing green screens get replaced with content, then you understand the concept of chroma keying. The other two methods are chroma keying and luminance keying.
We have integrated most of the modules as core features. With the release of ProPresenter 7, we no longer have add-on modules that cost extra.
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