Blackmagic ATEM Manual - Concept Music Art

74
Operating Your ATEM Switcher
Step 1. To set up a chroma key on upstream keyer 1 on the broadcast panel:
Step 2. 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.
Step 3. Select the CHROMA KEY menu button.
Step 4. The destination display will say key1fill. Select the fill source on the select bus. Since the key signal
is automatically generated from the fill source, the cut source is ignored.
Step 5. Adjust the chroma key controls to refine the key.
Chroma key parameters:
Hue
Gain
Y Suppress
Lift
Narrow
Fly Key
The hue adjustment selects the color that will be replaced. Rotate the hue knob
until the background keys through the desired color.
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.
The luminance suppression adjustment sets the black level of the region where
the chroma key level has been removed. Adjust the ysuppres knob until the black
level of the chroma removed region is correct.
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.
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.
Enables/disables DVE effects