MICROTRONIX DX-4400 Series, Руководство пользователя

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DX-4400
– 3G-SDI Text & Graphics Overlay Inserter – User Manual
Page 28 of 125
To avoid this behaviour, it is good practice to always define the Z position of objects when they
overlap.
3.8.2 Color and Transparency
Text and Graphic Fields have a Color specified by SVG Color Keyword Name assignments
– as defined by the
Scalable Vector Graphics (SVG) Specification
– (see:
http://www.december.com/html/spec/colorsvgsvg.html for a
color chart) or by using Red, Green, and Blue Components in the range from 0 to 255.
There are two Color components for Graphic shapes: (1) the Foreground Color used for fill and (2) the Border
Color used for the outline. The default Color is white (R255, G255, and B255).
For example, to change the fill Color of Graphic Field one to darkgoldenrod you can use either of the following
Commands:
G ID=1 FC=darkgoldenrod
G ID=1 FC=#184134011
The Foreground color has a Transparency property that can be controlled using the FA=aaa to set the Alpha
value for mixing with underlying layers. Setting the Alpha value to 0 sets the foreground color to be fully visible
and no content on lower video layers will be visible through the Color. An Alpha of 255 sets the Color fully
transparent. At this setting the color will be completely invisible.
For example: sending a G ID=1 FA=192 command makes Graphic Field 1 approximately 75% transparent.
3.8.3 Text Overlay Fields
Each Text Field has a Background color that is used for the background of Text Fields. Background color is set in
the same way as foreground Color, except the command used is
BC=darkgoldenrod
. The transparency for the
Background color can controlled using the BA=aaa command to set the Alpha value from 0 to 255 (the default is
fully transparent). A summary of the Text Overlay Commands is given in Table 8: Text Overlay Command Syntax
below.
The following example Commands set the Foreground Color to Yellow and the Background Color to blue for Text
Field 1 with partial (50%) visibility:
T ID=1 "Text: Yellow text on blue background, Alpha = 000"
T ID=1 FC=yellow FA=128 BC=blue BA=0
Notes :
1) When the text is partially transparent, its apparent color will be determined by the text color, the background
Color and the visibilities of the text and background.
2) When a text background is displayed, the total number of color / transparency combinations is limited. Small
changes in the color or transparency parameters of the text or background may not change the appearance
For each Text Field, a font / size combination can be selected using the
T ID=1 N="Font Name" P=xxx
command to
select one of the font options in Table 7: Text Font and Symbol Font Attributes .
Each Text Field can be turned on or off independently by the Visibility parameter V taking a value of YES or NO.
For example, to turn off the visibility of the above text enter the command.
T ID=1 V=no ‘ Turn Text ID 1 visibility OFF
After defining one or more Text Fields, all of the assigned Text Field strings can be listed using the follow Report
Text Field Command (from
Table 27: Miscellaneous Control Port Commands ):
RET
3.8.3.1 Available Text and Symbols Available Font & Symbol
The attributes of the text ASCI fonts and the extended font symbols available in the DX-4400 are listed in the
Table 7 below.