Performing An Advanced Chroma Key - Blackmagic Design ATEM Live Installations- Und Bedienungsanleitung

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.
3 Adjust the hue until the color hex dots are centered around black. Adjusting the hue
knob 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 vector scope.
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 Constellation 8K and ATEM 4 M/E Broadcast Studio 4K feature advanced chroma keying,
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.
TIP ATEM 2 M/E Broadcast Studio 4K can be upgraded to ATEM 4 M/E Broadcast
Studio 4K with a free software update. Simply install ATEM software version 7.3 or later
as detailed in the "updating the software" section in this manual.
To set up a chroma key on upstream key 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. 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 M/E 1 preview output.
Keying using ATEM Switchers 140