Ops 7–34 • Keying Vision Operator’s Manual (v12.0 MD)
Operating Tip — Use the luma threshold to select the part of the video that you don’t want
trails applied to, the background for example. Use the luma range to adjust for variations in the
background that you don’t want trails applied to.
•Use the Luma Thresh knob on the Border Menu to adjust for the parts of the
video that trails are applied to. Pixels that are brighter or darker than the Luma
Thresh, and not within the Luma Range, are used for creating trails. If the luma
threshold is set to 0.0% (black) only the brightest pixels are used for creating trails.
•Use the Luma Range knob on the Border Menu to adjust the range of the
brightness around the Luma Threshold that is not used for creating trails. If the luma
range is set to 100%, no trail is created.
This completes the procedure for applying a Hard trail to a key.
Key Trails
Key Trails applies a decaying image behind the key, using the alpha, leaving the key video
unaffected. The trail can use either the source video for the trail, or a matte color.
Note — You must be flying a key to properly use the Key Trails feature. If you are not flying a
key, the trail effect may not be visible.
Use the following procedure to apply a Key trail to a key:
1. Press the BORDER ON button on the Keyers Module to display the Border Menus.
2. Use the Border Mode knob on the Border Menu to select Trails.
3. Use the Trails Mode knob on the Border Menu to select Key.
4. Press Decay on the Border Menu.
Key Trails — Border Menu
•Use the Decay Rate knob on the Border Menu to adjust the amount that the trail
fades each frame. If the decay rate is set to 0.0%, the trail does not decay, and the
image becomes static. If the decay rate is set to 100.0%, the trail becomes
transparent.
•Use the Decay To knob on the Border Menu to select the type of decay that is
used. You can choose between the following:
› Video — Select this option to use the video content of the key to create the
trail.
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