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Operating your ATEM Switcher
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Luma Key Settings
Performing an Upstream Luma/Linear Key
Since luma and linear keys use the same parameters, they are set up on the software control panel and
broadcast panel using a common menu, called the luma key menu. What defines the key as being either
luma or linear is in the selection of fill and key sources. In a luma key, fill and key sources are the same.
For a linear key, fill and key sources are different.
To set up a luma/linear key on upstream keyer 1 on the software control panel:
Step 1. Expand the upstream key 1 M/E 1 palette and select luma from the key types bar.
Step 2. Select the fill source and key source.
If performing a linear key, select the same source for both fill and key.
Adjust the key parameters to refine the key. For a description of luma key parameters, refer to the table
below.
To set up a luma/linear key on upstream keyer 1 on the broadcast panel:
Step 1. Press the KEY 1 button in the transition control block to enable the keyer on the preview output.
The system control will dynamically navigate to the KEY 1 menu. You can manually navigate to the
KEY 1 menu by pressing HOME > EFFECTS KEYS > KEY 1.
Step 2. Select the LUMA KEY menu button.
Step 3. The destination display on the ATEM 1 M/E Broadcast Panel will say key1fill. Select the fill
source on the select bus.
Step 4. On the ATEM 2 M/E Broadcast Panel, hold down the KEY1/CUT button and select the
key source. On the ATEM 1 M/E Broadcast Panel, hold down the CUT/FILL button so the
destination display says key1 cut and select the key source.
If performing a luma key, select the same source for both fill and key.
Step 5. Adjust the clip and gain controls to refine the key or select 'Pre Multiplied Key' for pre-multipled
keys. The clip and gain are set automatically for pre-multipled keys.
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