GRASS VALLEY Kayak HD 100C, User Manual

Page: 337 / 558

Kayak — User Manual 337
Chroma Key Operating Notes
7. If this chroma key is acceptable, you are done. If set, lighting, or other
conditions prevent the result from being acceptable, you need to decide
whether to adjust the chroma key manually or use Auto Setup with FGD
Fade
on.
Manual adjustment permits retention of fine edge detail (see Manual
Chroma Key Adjustments on page 337 ). In particular, if there are problems
with translucent areas (hair, smoke) secondary suppression controls
can be useful (see Secondary Color Suppression on page 342 ) .
Auto Setup with F
GD Fade
on produces a chroma key with harder edges,
but accommodates wider set variations (see below).
Chroma Key Using Auto Setup with FGD Fade
If the set is lit unevenly or has other problems, FGD Fade is available to help
solve the problem. A better alternative, if time permits, is to adjust the
lighting on the set to even out the backing color. This may improve the key
so that FGD Fade is not needed.
1. If you decide you must use FGD Fade , follow the Auto Setup procedure
described above, but set
FGD Fade
on in the Keyer menu. After selecting
the backing color area and touching the top button on the Positioner,
the chroma key will be set up with coarser values better able to handle
set variations.
2.
If this chroma key is acceptable, you are done. If you are still not
satisfied, you can fine tune the chroma key using manual adjustments.
Manual Chroma Key Adjustments
If the Auto Setup of the hue fails to provide a suitable chroma key, addi-
tional controls are available in the Keyer Menu for fine tuning the key.
Chroma key manual set up consists of choosing the best set of compromises
to provide adequate detail and color fidelity to meet your needs. While
using this menu you need to view the chroma key scene on a monitor. A
vectorscope and waveform monitor can also be very useful when setting
up a chroma key. During set up you need to focus your attention on partic-
ular areas of the foreground, background, and/or composite. The areas you
look at will change depending on the individual controls being used.
Using the popup button
Output
you can select
FG Only
or
BG Only
to remove
extraneous picture information, allowing you to view only those areas of
the composite.
Chroma key set up procedures follow a recommended order, as indicated
by the numbered steps displayed on the menu. However, requirements can
vary depending on each individual scene. You may need to go back to