• Range — adjust the range of the Shadow colors.
Increasing the range value widens the Shadow
area by including lower-luminance background
colors. The increased range comes as a result of
colors moving from the Translucent area to the
Shadow area. Decreasing the range value narrows
the Shadow area by excluding high-luminance
colors. These excluded colors move back into
the Translucent area.
• Gain — adjust the shadow appearance.
Increasing the gain value creates darker shadows,
and decreasing the gain value creates lighter
shadows.
7. Press Translucency and use the Gain knob to
adjust the appearance of clear items such as eye-glass
lenses.
• Range — adjust the range of the Translucent
colors. Increasing the range value widens the
Translucent area by including more hues from
the Background range (the lower-end of the
range is dened by the Shadow range you just
set). Decreasing the range value narrows the
Translucent area by excluding hues.
• Gain — adjust the appearance of the Translucent
colors. Increasing the Gain value causes the
translucent colors to appear more opaque.
Decreasing the Gain value causes the translucent
colors to appear more transparent.
8. Press Transition and use the Gain knob to adjust
the appearance of the Transition area. The Transition
area is the range of pixels that are left over (i.e. not
in the Shadow or Translucency area).
• Gain — adjust the appearance of the Transition
colors. Increasing the gain value makes the
Transition area pixels more opaque. Decreasing
the gain value makes the Transition area pixels
more transparent.
9. Press Background and use the Sat Range,
Positive Hue, and Negative Hue to adjust the
Background area. Background elements are those
pixels in the source video that are the same color as
the one you chose to key out. Note that the Shadow
and translucent areas are completely contained
within the Background area.
• Sat Range — adjust the saturation range of the
background color. Increasing the saturation range
value includes a wider range of saturation values
to be included in the background. Decreasing the
saturation range value includes a narrower range
of saturation values to be included in the
background.
• Positive Hue — adjust the range of hues that
are included in the Background, expanding
clockwise around the color wheel.
• Negative Hue — adjust the range of hues that
are included in the Background, expanding
counter-clockwise around the color wheel.
10. Press More.
11. Press Foreground and use the Clip, Hue, and
Reject knobs to adjust the Foreground area. The
Foreground settings allow you to adjust the range
of colors which are considered Foreground colors,
and are keyed fully on.
• Clip — adjust the foreground clipping.
Increasing the clip value removes lower-saturated
colors from the Foreground image. Decreasing
the clip value includes lower-saturated colors in
the Foreground image.
• Hue — select the central, or base, color for the
foreground. Increasing the hue value moves
counter-clockwise around the color wheel to
select a base color. Decreasing the hue value
moves clockwise around the color wheel to select
a base color.
• Reject — include or reject hues adjacent to the
base color. Increasing the reject value decreases
the amount of adjacent hues that are included in
the foreground. Decreasing the reject value
increases the amount of adjacent hues that are
included in the foreground.
12. Press Spill Suppress and use the Clip, Hue, and
Reject knobs to adjust the amount of background
color that is spilling over into the foreground (green
color cast on the foreground from a green-screen for
example)
• Clip — adjust spill suppress clipping. Increasing
the clip value removes higher-saturated colors
from spill suppress correction. Decreasing the
clip value includes higher-saturated colors in
spill suppress correction. If your foreground
image contains bright-colored areas that are
suffering from background spill, decrease the
clip value to have it corrected.
• Hue — select the central, or base, color for spill
suppress correction. If the color spill does not
appear to be the same color as the background,
use this control to adjust which hue is considered
to be “spilled” into the foreground. Increasing
the hue value moves counter-clockwise around
the color wheel while selecting a base color.
Decreasing the hue value moves clockwise
around the color wheel while selecting a base
color.
Acuity Operation Manual (v9.2) — Keying • 49
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