OSEE GoStream Deck User Manual page 61

the program output source, and the combined is the result of background and
keyer. No further description below.
◼ Linear Key
A linear key consists of two video sources, which are the fill source and key
source. The fill source contains the video image that will be stacked on top of the
background, and the key source defines the black areas where will be made
transparent so that the background source can be revealed underneath.
The following images are an example of what background, linera key signals and
the resulting combined image might look like, as shown in Figure 4.1-45:
Here's how to generate the above linear key:
◼ Background Source: a full screen image, the program output source in the
switcher, here is a landscape of the Great Wall;
◼ Fill Source: the image to be stacked on top of your background video, and
the selection area is defined by key source;
◼ Key Source: the area defined in black which is set as key source will be
removed from the fill source, and the left area of fill source will leave as the
stacked part on top of background.
 Select fill source and key source for luma key by setting Luma Key →Source
menu item, and adjust the mask area by Luma Key→Mask, adjust the Pre
multiplied Key parameters by Luma Key→Control. Refer to "5.1.4 LUMA Key" for
the details about luma key parameters.
Figure 4.1-45 Linear Key Illustration
Panel Layout and Device Features
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