MICROTRONIX DX-4400 Series, Руководство пользователя

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DX-4400
– 3G-SDI Text & Graphics Overlay Inserter – User Manual
Page 47 of 125
Table 17: Video Background Color Command Syntax
Parameters Description of Command Syntax
BCx
–
Set the Background Color value for SDI channel x where x = 1 or 2
Color
The Background Color specified as RGB values or as a name. Refer to the section titled:
Color and Transparency on page
28 for details
3.9.5 Video Alpha Commands
The Video Alpha Commands set transparency of the SDI input video streams. The function and availability of
these commands depends on the current mode of operation:
•
These commands are not available for LDual TI and L4K TI .
•
In standard latency modes with a single video input per path ( Dual TI , ZDual TI, 4K TI, Zoom 4K TI ),
making the SDI video transparent has the effect of making the background color visible behind the video.
•
For the modes with two inputs per path ( PiP TI, LPiP TI ), making SDI input 1 transparent has the effect of
making the background color visible behind the video, and making SDI input 2 transparent has the effect
of making either input 1 or the background visible behind the video.
•
Alpha modes other than Constant Alpha (M=0) are available only in the PiP TI and LPiP TI modes.
In the PiP TI and LPiP TI modes only, the command provides the capability to select a color range of the input
video to be either visible or transparent (as in chroma key applications). This is useful for example when a
computer-generated overlay is connected to the secondary input and only the non-black parts of the video are
intended to be visible.
Each Saveset has its own set of Alpha Blend stored settings. The Video Alpha settable values are listed in the
table below.
Table 18: Video Alpha Command Syntax
Parameters Description of Command Syntax
ALx
–
Set the Alpha Blend value for SDI Input video x where x = 1 or 2
M=n
Set the Alpha Mode for the selected SDI Input.
This parameter is only available in the
PiP TI and LPiP TI modes.
For other modes, the unit always operates in the Constant Alpha mode and this command
is not accepted.
n=0
– Constant Alpha
The entire video frame has the same visibility as set by the B= parameter of the
command.
n=1
– Select Visible Range
The color parameters of the Alpha command select a range of input video colors that are
to be visible and are displayed with the alpha setting specified by the B= parameter.
Colors that do not fall within the selected range are transparent and are displayed with the
alpha setting specified by the TB= command.
n=2
– Select Transparent Range
The color parameters of the alpha command select a range of the input video to be
transparent. The transparent part is displayed with the alpha value set by the
TB= command.
Colors that do not fall within the transparent range are visible and are displayed with the
alpha set the B= command.