![]() 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, and this removes shades of gray/black to achieve the same effect. If you're familiar with watching the weatherman on your local news station, then you understand the concept of chroma keying. The other two methods are chroma keying and luminance keying. This tab will allow you to choose another display to select as an alpha send to allow your video switcher to use this as a true downstream key.Īn alpha key is one of three standard keying methods. To set this up, select your output from the "+" button next to "Audience", and then select the "Alpha Key" tab. ![]() This will provide users the ability to have a true Alpha key over graphics outputs (the HDMI/DisplayPort outputs of your computer), instead of video outputs (such as BlackMagic DeckLink or UltraStudio cards). In this version, you can assign any display to be the 'key' of another output. Starting in ProPresenter 7.14, there is an alternative way to set up an Alpha key with other outputs. You also have the choice of straight or premultiplied keys here as well. An NDI output is simply sent out over your network and can be picked up by a program/application/hardware unit that can receive an NDI signal. Setting up an NDI Alpha key is very straightforward. Lastly, for most setups, and if using a video switcher, an External Key is what most users need to select here. ![]() More information on these types of keys can be found in the article here. Navigating to the Alpha tab, you can enable a Straight key, Premultiplied key, or choose None to disable the key on this output, but for most users, Premultipled is the choice you’d select. The mode of the screen needs to match whatever your desired frame rate and resolution in your setup.Įven though you are sending two physical sources, you will only set up one DeckLink screen. In the screenshot below, this is set up as an SDI screen, from a DeckLink Duo2. The first step here is to select a screen that can be used with an Alpha key. Once this is done, open ProPresenter, and navigate to the Screen Configuration window from the menu bar. But for a BlackMagic 8K Pro, you’d want to set each connector as “in or out” for maximum flexibility. For instance, on the DeckLink Duo2, you’d set SDI 1 and SDI 2 together. For most devices, you will need to have your connectors mapped together. Inside of BlackMagic Desktop Video, you will need to set the card up for keying. Once the driver is installed, you will be prompted to restart the computer. We have a list of supported devices for BlackMagic products. To set up an SDI Alpha key in ProPresenter, you will first need to download the BlackMagic Drivers for your device. This is what ProPresenter calls an Alpha Key output. ProPresenter can generate sources for a switcher's keyer so partially transparent sources can be keyed over other sources in the video switcher. What is a Keyer?Ī "keyer" is what a video switcher uses to composite multiple sources. ProPresenter 7.14 is available to anyone who has a valid ProPresenter+ plan after.
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