User's Manual

2 In the LCD menu upstream key settings, set the key type setting to ‘chroma’.
3 Return to the upstream key menu and scroll down to the fill source setting. Select the
image you want to key as the fill source.
4 Adjust the chroma key settings while watching the preview output to refine the key.
When you are happy with your settings for the chroma key, press the 'menu' button to
step back through the menu until you return to the master program output.
To set up a chroma key on the upstream keyer 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.
Chroma key parameters:
Fill Source Selects the source to be keyed over the background. For example, a video
source of a weather presenter standing in front of a green screen.
Hue The hue adjustment selects the color that will be replaced. Rotate the
settings 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 until the edges of the keyed region appear the way
you want them.
Y Suppress Adjust this setting 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 Chroma
Key Range
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.
Enabling this setting uses a smaller acceptance angle around the chroma
key color. Choosing this setting temporarily, may help you center the hue
adjustment.
Mask Allows you to mask out sections of the key. For example, if the green screen
does not fill the edges of the screen, you can use the mask setting to select
only the area of the screen you want to use.
To return the mask to the default settings, select ‘reset mask’ and press the
set button.
128Keying using ATEM Switchers