Blackmagic Design ATEM Mini Manuel D'installation Et D'utilisation page 128

DVE key parameters
Enable key Enables/disables the DVE key. The DVE key is enabled when the button is
illuminated.
PreMult Select 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 a DVE channel 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 a DVE unavailable message will be displayed.
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 logo wipe transition is a popular transition that uses the DVE and moves a graphic across
the screen over a background transition. For example, the logo wipe moves a graphic over
a horizontal wipe, essentially replacing the wipe border. A logo mix spins the graphic across the
screen over a mix transition. Logo transitions are perfect for wiping the station logo or spinning
a football across the screen revealing a new background. Logo 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 logo 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 ATEM 1 M/E Advanced Panel:
1 Press the DVE transition type button in the transition control block. The DVE settings
menu will appear on the LCD.
If the DVE is already being used in an upstream key, the DVE transition type will not be
available for selection until the key is taken off air and off next transition.
Refer to 'sharing DVE resources' later in this section for more information.
Using ATEM 1 M/E Advanced Panel 128