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 and control knob adjusts the opacity of the keyed area. Usethis 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 and control knob 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 or chroma adjustment controls, your foreground elements should be cleanly
separated from the background.
While making key and chroma adjustments, it can be useful to assign one of your multiview
windows to show your key mask. For example, if your performing a chroma key on M/E 1, set
one of the outputs to “ME 1 KEY MASK 1.” This will give you a clearer view of your key for fine
adjustments.
Displaying your key mask
in a separate MultiView
window can make fine
tuning a key much easier.
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. You can correct these areas in the key using the ‘chroma correction’ settings.
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.
Matching your foreground and background
Once your foreground is properly separated from your green screen and you have adjusted
spill and flare suppression, use the ‘color adjustments’ controls to match your foreground with
the background.
Adjusting the brightness, contrast, saturation and color balance of your foreground image will
help blend it with the background so the effect is more convincing.
109Keying using ATEM Switchers
To Next Page
Loading...
