41
Color Spill
The
Color Spill
options and values are currently shown along the bottom of the display below. These
settings are used to control/remove any unwanted Chroma Spill from the background onto the foreground.
There are two sectors drawn on the
Chroma
palette, one represents the larger
Chroma Acceptance
range
and the other a smaller
Chroma Suppress
range.
Chroma Acceptance
sets how much of the
available colour range or space should be
Chroma
suppressed
. Usually starting with a large value of
120 degrees should produce reasonable results.
This value can then be fine tuned up or down
using the
F1 Function Dial
depending on the set
up of your green or blue screen studio.
Chroma Suppress
When set to 0%, this
removes the hues or colours that lie only on the
same axis as the
Chroma Matte
Hue angle, see
page 40
.
This setting has the effect of removing Background colour spill, but keeping the underlying hue.
When set to 100% then all the Chroma values that are ‘captured’ within the Chroma
Acceptance Angle
are
suppressed to mono – i.e. they have their Chroma removed. Usually starting with a value of 50% should
produce reasonable results. This value can then be fine tuned up or down using the
F2 Function Dial
depending on the set up of your green or blue screen studio.
The
Bgnd Suppress
Control is used to remove the Luma (brightness) of the background from the final
image. If the Chroma Key Output is showing Light Edges, then the
Bgnd suppress
can be used to suppress
any background Luma that is showing through on these edges.
Saving the Chroma Key set up
Once you are happy with the Chroma Key set up remember to
save your current user setup
(see page
30). In this way having several Chroma Key set ups saved to different user memory slots allows you to
switch from a Blue screen to Green screen set up quickly.
Luma Key Overview
Luma Keying with the SE-3000 allows you to use an image, ideally black and white,
to combine two images. The black element of the key image will be replaced by the
full colour background image, and the white element will be replaced by the full
colour key fill image. So the example sources shown on the left should produce the
keyed output below.
