Ultimatte-9 Operations Manual
March 1, 2000
63
2. BG Defocus
This control adjusts the amount of “defocusing” done to the BG scene when Defocus Enable is
set. At 0% the sharpness of the original image is left intact.
When setting the limits of the automatic BG defocusing, adjust BG Defocus to the appropriate
amount for a distant FG subject, and then press SET MIN. Adjust BG Defocus to the appropriate
amount for a closer FG subject (by moving the subject and camera closer together, or by
zooming in), and then press SET MAX. After setting these two parameters and when Defocus
Tracking is enabled, the amount of BG Defocus is automatically adjusted (between the two limits)
based on the size of the FG subject in the frame.
3. Defocus Transition Rate
When Defocus Tracking is enabled this control sets the rate at which the BG defocus starts and
ends. At minimum setting (Fast: F/1), the amount of defocusing starts and ends abruptly. At
maximum setting (Slow: S/16), the amount of defocusing starts and ends smoothly.
4. BG Defocus Sensitivity
This control sets the amount of change in size of the FG subject (compared to the size of the
frame) to occur before it is interpreted as a change in defocus amount. This control eliminates
“jitter” in the defocusing process as the FG subject size changes. This control is only active when
the Defocus Tracking switch is enabled.
5. Defocus Enable
Enables all defocus functions
.
6. Mask Enable
When enabled, areas in the BG scene defined by the key (alpha) signal connected to MATTE IN
will be masked from the defocus function.
7. SET MIN
Sets the minimum size of the FG subject (farthest position) in the frame at which point the
process of automatic defocusing of the BG scene starts. The MIN value must be
less
than the
MAX value
.
8. SET MAX
Sets the maximum size of the FG subject (closest position) in the frame beyond which there
would be no more change in the automatic defocusing of the BG scene. The MAX value must be
greater
than the MIN value.
9. Defocus (Mask) Invert
When enabled, this button inverts the polarity of the Matte In signal ONLY as used as Defocus
Mask. DEFOCUS (MASK) INVERT button does not alter the polarity of the Matte In signal as a
“Garbage Matte” function.