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Proper key and fill operation requires two clips of identical length, using the following naming
convention: (the clip “myfile” is used as an example)
Fill name: myfile
Key name (Alpha): myfile_. Note the underscore at the end of the key clip.
When a clip is opened/cued on Channel 2, Image Server automatically looks for another clip
with the same name, plus a trailing underscore. If the clip is found, it is loaded on Channel 3.
Typically, the Channel 2 clip contains the “fill” material, while the Channel 3 clip has the “key”
(or alpha) file.
An automation system, could, for example, issue a VDCP Cue command to Channel 2 for a
clip called “logo”. Channel 3 would automatically be loaded with clip “logo_”. A Still or Play
command sent to Channel 2 would cause both Channels 2 and 3 to display the fill and key
clips, respectively.
Note that the VDCP checkbox option to “show first frame” for a Cue command is ignored for
channels in ganged mode. The automation system must issue a Still command to Channel 2 to
achieve this effect.
Ingesting a TARGA file via FTP automatically creates a key clip and a fill clip, each a single
frame in length. For example, if file “xyz.tga” is transferred to an Image Server via FTP, then a
pair of single-frame clips is created: “xyz” and “xyz_” containing the fill and key material.
Still Frames
A single-frame clip (a “still”) may be inserted into a playlist. The length of a still will appear as
one frame in the clip list. When a still is encountered, the playlist will pause and hold the still
image until a Play command is issued, at which point the playlist will continue to the next clip
in the list. When using the GUI, the space bar (a keyboard shortcut) will also advance the
playlist. Stills may be placed anywhere in a playlist. In fact, a playlist may be entirely
composed of stills.
Stills are created when TARGA files are ingested. (See Page 51 for a description of TARGA file
ingest.)