Store memory, Keying graphics, Store memory keying graphics – Grass Valley Imagestore 750 v.3.0.1 User Manual
Page 48: External graphics
32
Features
Store Memory
Store Memory
The entry-level Imagestore 750 (either an IS-750 or an IS-750-LOGO) provides storage shared
between the 4 keying layers for up to 512 MB of images or animations with their associated
keys. The IS-750-MEM-2GB upgrade expands this storage to 2
GB total.
The percentage of total store memory allocated to each of the four stores can be configured.
This is useful if you want to assign one keying layer to long animations, and other layers for
smaller logos or external fill/key. There are two ways to change the allocation:
•
At the front panel: use ‘Setup > Stores > Stores Memory’.
•
In the Imagestore 750 Configurator: choose the ‘Store Manager’ tab under ‘Configuration
Mode’. See
on page 161.
You should always load media files into the store memory before they are keyed over back-
ground video. Stored images and animations can be taken to air by fade or cut transitions. An
automation pre-load capability (command
R7
) allows the next animation to be loaded in
advance while another animation is on-air, provided there is sufficient memory, to avoid playout
delays on-air. However, it is preferable to use two keying layers to switch between different
media whenever possible.
It is recommended that a media management system is used to transfer media to the Images-
tore 750. It is possible to load media using Miranda’s Media Conversion Software (or other
Miranda tools), from a USB device or via an FTP transfer (see the
section for more
information).
Keying Graphics
Keying is the process of inserting one video signal (a fill signal) into another video signal (the
background signal) according to a third signal (the key signal). The key signal governs the trans-
parency of the fill signal.
Fill and key signals can be obtained from the following sources:
•
An external graphics playout device, such as the Intuition XG, fed into a fill and key input.
•
Internal media files loaded into store memory.
You can control the following keying parameters:
•
Source
•
Clip, gain and transparency
•
Type
•
Sense
•
Masking
External Graphics
You can connect an external graphics device or CG to the Imagestore 750’s BNC pairs (Fill-1,
Key-1), (Fill-2, Key-2) or (Fill-3, Key-3). The fill and key signals may then be fed to any of the
supported keying layers and keyed up, or down, as required.
See
on page 39 for a description of the various keying parameters.