Performing an Upstream Chroma Key
To set up a chroma key on upstream keyer 1 on the software control panel:
1 Expand the upstream key 1 M/E 1 palette and select chroma from the key types bar.
2 Select the fill source.
3 Adjust the key parameters to refine the key. For a description of chroma key
parameters, refer to the table below.
To set up a chroma key on upstream keyer 1 on the broadcast panel:
1 Press the KEY 1 button 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.
2 Select the CHROMA KEY menu button.
3 On the ATEM 1 M/E Broadcast Panel, the destination display will say key1fill. On the ATEM
2 M/E Broadcast Panel, the KEY 1/CUT button will be lit. Select the fill source on the
select bus.
4 Adjust the chroma key controls to refine the key.
Chroma key parameters:
Hue The hue adjustment selects the color that will be replaced. Rotate the
hue knob until the background keys through the desired color.
Gain The gain adjustment determines how the colors around the selected
hue are keyed. Adjust the gain knob until the edges of the keyed region
appear the way you want them.
Y Suppress Adjust this knob until the black level of the chroma removed region
is correct.
Lift Lift should normally be set to zero for a well set up chroma key scene.
Lift allows very low saturation values of the keyed color to be excluded
from the key. Colored light spilling onto a neutral colored object in the
foreground will sometimes cause small areas to key to the background
source. Lift allows you to fill these small holes in the key signal.
Narrow The acceptance angle of colors around the selected hue should
generally be as broad as possible to achieve natural looking chroma
Keys. Sometimes, if some colors in the fill source are too close to the
chroma key color, it may be hard to exclude them from the key.
Selecting the narrow button uses a smaller acceptance angle around
the chroma key color. Selecting narrow temporarily, may help you
center the hue adjustment.
Flying Key Enables/disables DVE effects.
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 off.
2 Set lift to 0.
141141
Operating your ATEM Switcher