DVE key parameters
Enable key Enables/disables the DVE key. The DVE key is enabled when the button
is illuminated.
PreMult Selects the DVE key as a pre-multiplied key.
Clip The clip level adjusts the threshold at which the key cuts its hole. Decreasing
the clip level reveals more of the background. If the background video is
completely black then the clip value is too low.
Gain The gain adjustment electronically modifies the angle between on and
off thereby softening the edges of the key. Adjust the gain value until the
edge softness is desirable but the background video luminance (brightness)
is not affected.
Inverse When the key is not pre-multiplied, inverts the key signal.
Sharing DVE resources
ATEM features DVE channels which can be used to perform DVE transitions or used in an
upstream keyer. When you select a DVE transition, if the DVE is used elsewhere in the system,
the DVE transition type will not be available and, on the advanced panel the DVE button will
be disabled. In order to use the DVE transition you must free the DVE from where it is currently
used. Verify that the upstream keys currently on program or preview are not DVE keys and
do not have flying key enabled. To free DVE from the upstream keyer, change the key type to
anything other than DVE or disable flying key. The DVE will be released and therefore available
for use as a DVE transition.
The graphic transition is a popular transition that uses the DVE and moves a graphic across the
screen over a background transition. For example, the graphic wipe moves a graphic over a
horizontal wipe, essentially replacing the wipe border. A graphic mix spins the graphic across
the screen over a mix transition. Graphic transitions are perfect for wiping the station logo or
spinning a football across the screen revealing a new background. Graphic transitions use a
special keyer built into the transition block, leaving all of the upstream and downstream keyers
available for compositing the output. The following section explains how to build and perform
graphic transitions.
The above image sequence provides an example of the program output for a graphic wipe transition.
Performing a Graphic Transition
To perform a graphic transition on the software control panel:
1 Select the DVE transition style button in the transition control block.
If the DVE is being used in an upstream key, the DVE transition style button will be
unavailable for selection until the key is taken off air and off next transition. Refer to sharing
DVE resources in the next section for more information.
2 Expand the transition palette and select the DVE transition type. Use the previous
or next arrows to select a different DVE type.
3 From the effects options select the graphic wipe transition.
4 Select the fill source and key source for the graphic from the drop down list.
5 Adjust the key parameters if required.
99Operating your ATEM Switcher
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