Grass Valley LGK-3901 - Manual (Page 29)

GUIDE TO INSTALLATION AND OPERATION
LGK-3901/DSK-3901 | 23
4.8 Keying Graphics
Keying is the process of inserting one video signal (the Fill signal) into another video signal (the Background signal)
according to a third signal (the Key signal).
Graphics fill/key signals may be sourced from the following methods:
• External graphics device fed into a Fill/Key input BNC (LGK-3901/DSK-3901)
• Internal media files loaded into Store Memory (see section 4.7) (LGK-3901 only)
The following keying parameters may be adjusted for both of these methods:
• Source (section 4.8.5.1)
• Clip, Gain and Transparency (section 4.8.5.2)
• Type (section 4.8.5.3)
• Sense (section 4.8.5.4)
• Masking (section 4.8.5.5)
4.8.1 External Graphics
An external graphics device or CG may be connected to Fill-1/Key-1 or Fill-2/Key-2 inputs (see sections 5.4.2 and
5.4.3). These signals may then be fed to any of the supported keying layers (five layers for LGK-3901; two layers for
DSK-3901) and keyed up or down as required.
Section 4.8.5 describes the different keying parameters that may be used for external graphics.
4.8.2 Internal Media
Internal media only applies to LGK-3901.
The following styles of internal image file may be cut or faded onto any keying layer with an associated store:
• Images OXT
• Animations OXA
• Easytext OXA
• Bugclock OXA
Section 4.8.5 describes the different keying parameters that may be used for internal graphics.
4.8.2.1 Images
Logos and full-frame still images are defined within OXT image files. The image file embeds information such as the
on-screen position, keying source (see section 4.8.5.1) and keying type (see section 4.8.5.3). The transparency may
be defined via a key image, and so effects such as soft edges can be easily applied.
OXT image files may be generated using one of the following applications:
• Xplorer
• Animation Builder (available from the MCS CD)