Blackmagic ATEM Manual - Concept Music Art
Blackmagic ATEM Manual - Concept Music Art
Blackmagic ATEM Manual - Concept Music Art
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67<br />
Operating Your <strong>ATEM</strong> Switcher<br />
Keying on <strong>ATEM</strong> Switchers<br />
Keyers are a powerful production tool allowing multiple layers of video and graphics to be stacked on top<br />
of the background. When a new layer of video is stacked on the background, the video or graphic needs to<br />
be cut out so that the background video can be seen. The process of cutting out parts of the layered picture<br />
and revealing the background is called keying. There are various methods that can be used to cut a hole<br />
in the image. The various methods correspond to the different types of keys available on the switcher. The<br />
following section explains luma, linear, chroma, pattern and DVE keys, all of which can be used in both the<br />
upstream and downstream keyers.<br />
Understanding Keying<br />
A key requires two video sources; the fill signal and the key or cut signal. The fill signal contains a video<br />
image which is to be stacked on top of the background, while the key signal is used to select regions of<br />
the fill signal to be removed or cut out. The fill and key signals can be selected from any of the switcher's<br />
external inputs or internal sources, allowing both still and moving images to be used as fill or key sources.<br />
Fill and key signals are selected on the software control panel from drop down lists in the upstream and<br />
downstream key palettes. On the broadcast panel, fill and key signals are selected using the select bus.<br />
There are two types of keyers used in the switcher; upstream keyers and downstream keyers. Four upstream<br />
keyers, also known as effects keyers, are available in the switcher's M/E block. Each upstream keyer can be<br />
set up as a luma, linear, pre-multiplied, chroma, pattern or DVE key. Two downstream keyers are available in<br />
the dedicated DSK block. Each downstream keyer can be set up as a luma or linear key.