Adobe 25510629 User Guide - Page 37

Color Control area

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A) Key B) Opaque/transparent axis (opaque at the top) C) Subject D) Similar colors/distant colors axis (similar colors at left) E) Transparency: Sets range of transparency of reference key color F) Alpha Curve: Controls the softness of edges of keyed subject G) Start Threshold: Sets range of color made transparent H) All colors in this range are fully keyed out (transparent). I) Colors in this range are semi-transparent. 1: The color at this point is 25% opaque; 2: The color at this point is 75% opaque. J) All colors in this range are totally opaque (subject). Color Control area Start Level: Controls the starting range of the desaturation curve in the input clip. The effect of this setting on the Color Curve graph corresponds to that of the Start Threshold setting on the Alpha Curve graph. Desaturation: When a foreground is photographed against a saturated key color background, some of the light bouncing off of the background falls on the foreground, causing the foreground to change to the hue of the replaced background. This is sometimes called spill. Desaturation compensates for spill by reducing the saturation of certain color ranges. This can simplify the correction of severe color problems in the input clip. The effect of this setting on the Color Curve graph corresponds to that of the Transparency setting on the Alpha Curve graph. User interface 37

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User interface
37
A) Key B) Opaque/transparent axis (opaque at the top) C) Subject D) Similar colors/distant
colors axis (similar colors at left) E) Transparency: Sets range of transparency of reference key color
F) Alpha Curve: Controls the softness of edges of keyed subject G) Start Threshold: Sets range of
color made transparent H) All colors in this range are fully keyed out (transparent). I) Colors in
this range are semi-transparent. 1: The color at this point is 25% opaque; 2: The color at this point
is 75% opaque. J) All colors in this range are totally opaque (subject).
Color Control area
Start Level:
Controls the starting range of the desaturation curve in the input clip. The effect
of this setting on the Color Curve graph corresponds to that of the Start Threshold setting on
the Alpha Curve graph.
Desaturation:
When a foreground is photographed against a saturated key color background,
some of the light bouncing off of the background falls on the foreground, causing the
foreground to change to the hue of the replaced background. This is sometimes called
spill
.
Desaturation compensates for spill by reducing the saturation of certain color ranges. This can
simplify the correction of severe color problems in the input clip. The effect of this setting on
the Color Curve graph corresponds to that of the Transparency setting on the Alpha Curve
graph.