RGBlink IC2+ User Manual page 59

●Brightness: Usually refers to the amount or intensity of video light produced on a
screen without regard to colour. Sometimes called black level.
●Contrast Ratio: The ratio of the high light output level divided by the low light
output level. In theory, the contrast ratio of the television system should be at least 100:1,
if not 300:1. In reality, there are several limitations. Well-controlled viewing conditions
should yield a practical contrast ratio of 30:1 to 50:1.
●Colour Temperature: The colour quality, expressed in degrees Kelvin (K), of a light
source. The higher the colour temperature, the bluer the light. The lower the temperature,
the redder the light. Benchmark colour temperature for the A/V industry include 5000°K,
6500°K, and 9000°K.
●Saturation: Chroma, Chroma gain. The intensity of the colour, or the extent to which
a given colour in any image is free from white. The less white in a colour, the truer the
colour or the greater its saturation. Saturation is the amount of pigment in a colour, and
not the intensity.
●Gamma: The light output of a CRT is not linear with respect to the voltage input.
The difference between what you should have and what is actually output is known as
gamma.
●Frame: In interlaced video, a frame is one complete image.A video frame is made up
of two fields, or two sets of interlaced lines. In a film, a frame is one still image of a series
that makes up a motion image.
●Genlock: Allows synchronisation of otherwise video devices. A signal generator
provides a signal pulses which connected devices can reference. Also see Black Burst and
Color Burst.
●Blackburst: The video waveform without the video elements.It includes the vertical
sync, horizontal sync, and the Chroma burst information. Blackburst is used to synchronize
video equipment to align the video output.
●Colour Burst: In colour TV systems, a burst of subcarrier frequency located on the
back part of the composite video signal. This serves as a colour synchronizing signal to
establish a frequency and phase reference for the Chroma signal. Colour burst is 3.58 MHz
for NTSC and 4.43 MHz for PAL.
●Colour Bars: A standard test pattern of several basic colours (white, yellow, cyan,
green, magenta, red, blue, and black) as a reference for system alignment and testing. In
NTSC video, the most commonly used colour bars are the SMPTE standard colour bars. In
PAL video, the most commonly used colour bars are eight full field bars. On computer
monitors the most commonly used colour bars are two rows of reversed colour bars
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