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Glossary
Glossary
Term Description
Brightness
(Perceived)
The brightness of a projection system can be precisely measured with a light meter. For example, a
typical movie theater is setup to deliver 16 foot-Lamberts. The higher the foot-Lamberts, the brighter
the image. A common misconception is that a projector with twice the foot-Lamberts of another
projector will be twice as bright. While it is true that a light meter will detect it as twice as bright, your
eye will not. The perceived brightness will increase by about 50%. It will not double because the
human eye has a logarithmic respond to light.
Brilliant
Color

Brilliant Color - a technology developed by Texas Instruments
®
for its DLP
®
projectors that produces
six channels of colour including red, green, blue, cyan, magenta, and yellow; thereby, allowing an
increase in the colour gamut.
Calibrate To adjust with reference to a standard.
Channel A separate signal or signal path.
Closed Caption Closed caption (CC) superimposes a transcript of the audio portion of a video program over the
program image. Its primary use is to provide people that are deaf or hard of hearing the opportunity
to read a transcript of the audio as it is being played. Closed Caption is also helpful for people learning
to read or learning a foreign language. Closed Caption can also be used to display text unrelated to
the program being viewed, such as weather or news.
Coated Optics A variety of materials put on high quality lenses to minimize the amount of light reflected back to the
lamp and the amount of ambient light that mingles with the focused light leaving the lens. Generally
good coatings can add 15% or more to the lenses brightness. Other coatings are used for filtering
colours.
Coaxial An audio or video cable with a single internal wire with an outer shield that is ground. In audio, a
speaker type where one speaker is positioned within another larger speaker’s cone.
Colour
Dynamics
The whitest whites, reddest reds, bluest blues and greenest greens. High colour dynamics are
a result of dynamic range/contrast ratios. Having excellent colour dynamics implies rich colours,
excellent definition, high contrast.
Colour
Saturation
Measure of colour purity. Highly saturated colours emit a very narrow band of wavelengths of light
instead of the broader spectrum of frequencies emitted from mixed colours. A display with good
saturation capability will look vibrant.
Colour
Temperature
Colour balance of white light which goes from red to blue as the temperature rises. Measured in
degrees Kelvin, which starts at absolute 0 or –273 degrees Celsius, colour temperature matches the
reference standard of the light being emitted from a carbon block heated to the stated degrees. For
instance, the early morning sun is around 2500K, which is the same warm light that a carbon block
heated to 2227° Celsius would emit. Heating the block further to ~10000° Celsius would emit the
same bluish light of a blue-sky mid-day sun. Common colour temperatures are 5500 Kelvin (black
and white movies) and 6500 Kelvin (standard colour films).
Colour Wheel Rotating wheel with 3 or more translucent colour filters used to display sequential colour on single
imager light valve based projection devices. The imager reflects or transmits the colour component
of a given image when the wheel’s corresponding colour filter is affecting the light passing through
to the lens. A 1X wheel cycles through all colours in 1/60th of a second.
Component
Video
Component Video is a method of delivering quality video (RGB) in a format that contains all the
components of the original image. These components are referred to as luma and chroma and are
defined as Y'Pb'Pr' for analog component and Y'Cb'Cr' for digital component. . It is comprised of
luminance (Y) and two chrominance channels of blue minus luminance and red minus luminance.
Contrast
Contrast increases as the white point increases. Increasing the white point creates a greater
difference between white and black.