Blackmagicdesign ATEM Mini Installation And Operation Manual page 96

Click the preview button to check the final composite on the preview output
Fine Tuning your Key using Key Adjustments
Once you have achieved a good chroma sample that removes most of your green screen
while generally retaining foreground elements, its time fine tune your key with the
'key adjustments' controls.
Foreground
Use the 'foreground' slider to adjust how opaque the foreground mask is. This determines the
strength of the foreground against the background. By increasing the slider, you can fill in any
small areas of transparency inside your foreground image. We recommend moving this slider
and stopping as soon as the foreground becomes solid.
Background
The 'background' slider adjusts the opacity of the keyed area. Use this slider to fill in any small
foreground artifacts left over in the area of the image you want to remove. We recommend
moving the slider until your keyed area is consistently opaque.
Key Edge
The "key edge" slider moves the edge of your keyed area in or out, helping to remove
background elements from the very edge of your foreground or extending the foreground out
a little if your key is too aggressive. This can be especially useful with fine details like hair.
We recommend moving this slider until the edge of your key is generally clean, without any
background artifacts visible.
Using the key adjustment controls, your foreground elements should be cleanly separated from
the background.
Chroma Correction using Color Spill and Flare Suppression
Light bouncing off a green screen can create a green edge to foreground elements as well as
a general tint to the foreground, or fill image. This is called color spill and flare. The 'chroma
correction' settings let you improve the areas of the foreground that are affected by color spill
and flare.
Spill
Adjust the spill slider to remove colored tint from the edges of foreground elements.
For example, green reflections bouncing off a green screen.
Flare Suppression
Flare suppression removes overall green tint evenly across all foreground elements.
Keying using ATEM Mini 96