Vision Operator’s Manual (v12.0 MD) Keying • Ops 7–33
•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.
This completes the procedure for applying a Soft trail to a key.
Hard Trails
Hard Trails applies a decaying image behind the motion with no transparency applied to the
moving object (Figure 7.10). Hard Trails uses the brightness (luminosity) of the moving object to
calculate the trails. To adjust this, you can use the Luminance Threshold and Luminance Range to
separate the moving object from the background.
Hard Trails are best applied to a stationary background with moving elements in the foreground.
Figure 7.10 Hard Trails
Operating Tip — For the best results, the moving objects in the video that you want to apply
trails to should be brighter than the background.
Use the following procedure to apply a Hard 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 Hard.
4. Press Decay/Threshold on the Border Menu.
Hard 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 0.1%, the trail decays very slowly, and
the image becomes static. If the decay rate is set to 0.0%, no trail is created.
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