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For a Chroma Key Screen
there are basically three different options blue, green, and Chromatte.
Each Chroma Key Screen has it's advantages; blue is the color opposite
of skin tones and blond hair making it a better choice if you can
control what your talent wears. Green tends to be more common because
if you can't control what people are going to wear you are going to
be safer with green because people wear more chrominant blue than
green (except on St. Patrick's Day). Chromatte is a completely different
means of keying altogether using reflective fabric and a circle of
LEDs on the camera to generate the chrominance, the advantages to
this are that the talent can be flush against the material (there's
no spill) and the keying can happen in comparatively low light conditions.
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A frequent topic of debate is which color is better
for Chroma Key Screen; blue or green. Traditionally video cameras
and film have been more sensitive to blue light making a key easier
to pull than green. However this is not as true as it once was and
the fact that green has a higher reflectance spectra yielding more
candela (basically it's brighter) makes this facet of the debate nearly
irrelevant. Now spill is another matter, and having a keyer with spill
suppression like Ultimatte
or Ultra or Ultra
Keyer makes a big difference here. Blue spill tends to be a bit
more visibly agreeable than green spill (again because the green yields
more candela meaning more light is spilling onto your talent), but
again a keyer with spill suppression will alleviate this. The final
answer usually depends on whether you can control what your talent
wears or not.
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Reflecmedia's Chromatte
is a Chroma Key Screen that takes the whole issue of blue and green
to another level adding in gray. But in fact that's not what the camera
sees, the camera sees the material as the color of the LEDs around
the camera blue or green. Click here for more info on Chromatte.
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