User's Manual

Setting up a Chroma Key on Upstream Keyer 1
using ATEM Advanced Panels
1 Press the ‘key 1’ button to enable keyer 1 on the preview output. This automatically
selects the keyers menu on the system control LCD, but you can also press the
‘keyers’ button to enter the menu directly.
2 Select the ‘chroma’ key type using the corresponding ‘key type’ control knob.
3 Select your fill source by turning the corresponding LCD control knob. You can
also select a fill source by pressing the corresponding button in the source
select bus.
4 Use the ‘left’ and ‘right’ arrow buttons to access additional key parameters you
may want to adjust such as hue, gain, y suppress, lift and masking.
TIP When adjusting settings on ATEM Advanced panels, you can restore all settings to
their defaults by holding down the shift key and pressing ‘reset’. To reset individual
parameters, hold down the shift key and press the corresponding soft controlknob.
Adjusting parameters with a vectorscope
You may wish to set up a chroma key using color bars as the background source, and watching
the result on a vector scope as you perform the following procedure.
1 Turn narrow chroma key range off.
2 Set lift to 0.
3 Adjust the hue until the color hex dots are centered around black. Adjusting the hue
will offset the black point, and the constellation of the 6 color bar dots will rotate around
the screen.
4 Adjust the gain until the color bars are near their target boxes on the vectorscope.
Adjusting the gain will expand and contract the color vectors about the center.
5 Adjust the Y Suppress knob until the black level is correct.
Performing an Advanced Chroma Key
ATEM Television Studio Pro 4K features an advanced chroma keyer with more detailed chroma
sampling and adjustment options. These controls help you achieve the best key, improving the
blend of foreground and background so you can create a more convincing visual effect.
To set up a convincing chroma key using the advanced keyer:
1 Expand the upstream key palette and select ‘chroma’ from the key types bar.
2 Select the fill source. Typically, this source would be from a camera facing a presenter
in front of a green screen, or a graphic loaded in a media player.
3 Click the ‘chroma sample’ button. With the chroma sample selected, you’ll see a
new panel appear with a box cursor. This cursor is also visible on the multi view’s
preview window.
129Keying using ATEM Switchers