Grass Valley Kayak HD v.6.9.3 - Manual (Page 385)

Kayak — User Manual 385
Chroma Key Operating Notes
Other Chroma Key Controls
Additional chroma key controls are available by touching the Other data
pads (Figure below). Coring, fringe, and shadow controls can be individu-
ally activated by touching the labeled buttons.
Data Pad 1 contains Shadow Clip / Shadow Gain / Shadow Opacity
Data Pad 2 contains Coring and Fringe
Figure 305. Other Controls Part1, Shadow Clip / Shadow Gain / Shadow Opacity
Coring replaces any pixels in the luminance signal after primary suppression
that are below the adjustable threshold with black. This eliminates noise
resulting from incomplete suppression. While coring can improve some
keys, it can easily be over done. Coring thresholds much above black will
affect dark grays that are actually part of the foreground subject, making
the chroma key composite look unnatural.
Fringe is used to restore color to the gray portions of the foreground color
resulting from secondary suppression adjustments. This control is only
active when secondary suppression is on.
Shdw provides controls of shadows that fall on the backing. Shadow Clip and
Shadow Gain allow selecting the range of the luminance portion of the fore-
ground that produces a shadow. Shadow Density is an opacity control for the
shadow and adjusts how much shadow is added to the background.