Key FOREGROUND Asset

The Precision Keyer can work on foreground assets (SCENE > Foreground) or on texture which are used within the scene.

Key Textures in Scene Tree

If used within the scene, simply drag the media asset in the scene tree and enable the Keyer. Do not add any geometries (for example, Rectangle) on the container!

NDI

If you want to use the Precision Keyer with active NDI output in a VS setup, please be aware that Viz Engine puts the matte of the Keyer on the key signal. Depending on the device which is used to read the NDI signal, this key might be already applied and thus Virtual Studio elements are not visible on the NDI output. To fix this, you need a fullscreen key or a device which shows fill (RGB) independently from key (Alpha). To enforce Viz Engine to send a fullscreen key, please enable verbose mode in the Viz Engine Configuration and search for ForceKey... in the configuration file and enable this flag.

Hue Adjust

The Keyer works best if the background is perfect green (RGB(0, 255, 0)) or perfect blue (RGB(0, 0, 255)). As this is not what we have in most real-world setups, you need to color-shift the input signal until you get perfect green or perfect blue.

Enable the Matte view and adjust the hue shift until you have the maximum of contrast you can get. In perfect scenarios, this would mean that you get a full white background, and a opaque black foreground. Depending on your lighting situation, you will not get perfect white and black on the matte view, this is handled in the next steps. Try to find the hue shift which is the best you can get now, and use 100% for the white point (Transparency) and 0% for the black point (Opacity) to see the unscaled values while adjusting the hue shift.

White Point (Transparency) and Black Point (Opacity)

After the hue adjustment, we should adjust the white point. This scales the input values so that the background is fully keyed (full white on the Matte view). Start from 100% and reduce it until the background is fully white, Do not reduce it more as necessary, as it would start remove details at the border of the foreground.

Now we need to find the black point, which scales and shifts the input values so that the foreground is fully opaque. Start from 0% and increase it, until your foreground is fully opaque. Have a look on details and borders and do not increase it more as necessary.

Processed Foreground / RGB

After the base adjustment of the hue and the white point and black point, you should adjust the RGB values of the processed foreground. These values are subtracted from the input signal and then are used in a linear keying mechanism, so the goal would be that these RGB values match the color of the background. Try to adapt the values so that they match the dominant color of the unprocessed input, but make sure that you do not use higher RGB values as needed. Incorrect or too high values decrease the quality of the linear keying and get noticeable with false colors around the edge between foreground and background.

Cyan / Magenta / Yellow Gain (CMY Gain)

Due to the despilling process, which removes greenish / blueish parts of the skin, it can happen that the color tone is modified too much. Use the CMY gain adjustment to bring Cyan, Magenta or Yellow back as necessary.

Final Result

Now add a background or your Virtual Studio and check the result:

Background Lightwrap and Color Lightwrap

Color Lightwrap

Adds a specific color either around the edge (Edge Gain) or in the spill areas (Spill Gain).

Background Lightwrap

Blends with the background, either around the edge (Edge Gain) or in the spill areas (Spill Gain)