Reality is restricted to work with opaque video channels and can also send or receive fill and key as separate channels with its engine. Fill and key are two separate channels of video in which signals are passed as live Fill source (color) that contains transparency (alpha channel) and live Key source that is the same graphics as Fill source but with just two tones (black and white), where black is transparent and white displays the fill source used as the mask. It is a reverse keying output when you need to combine fill and key inputs.

In a broadcast production environment, overlay graphics are essential requirements that demand fill and key channels for overlaying/superimpose graphics on top of other video programs. Reality can manage this easily with its supported video I/O cards. Reality provides hardware synchronized Fill and Key signals from AJA card’s physical ports, allowing possibilities to send Fill and Key video channels over independent SDI ports from Reality Engine or accept Fill and Key channels from other CG systems use as DSK over Reality's virtual studio composition.

Let us understand how to achieve fill and key with Reality. We have explained the connections of hardware and also settings which need to be done in software is described below in this article.

As a general rule, both sources should have the same video format for proper mixing, i.e., they should have the same frame rate and the same resolution.

Fill and Key Supported Hardware



Corvid 44 BNC


Corvid 88


Corvid 44-12G BNC