Yc waveform, Ycbcr parade – Adobe Premiere Pro CS3 User Manual
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ADOBE PREMIERE PRO CS3
User Guide
280
YC Waveform
The YC Waveform displays a graph showing the signal intensity in the video clip. The horizontal axis of the graph
corresponds to the video image (from left to right) and the vertical axis is the signal intensity in units called IRE
(named for the Institute of Radio Engineers).
The YC Waveform displays luminance information as a green waveform. Bright objects produce a waveform
pattern (bright green areas) near the top of the graph; darker objects produce a waveform toward the bottom. For
NTSC video in the United States, luminance levels should range from 7.5 to 100 IRE (sometimes referred to as the
legal broadcast limit). Japan’s implementation of NTSC standards permits a luminance range from 0 to 100 IRE.
Generally, luminance and chroma values should be about the same and distributed evenly across the 7.5 to 100 IRE
range.
The YC Waveform also displays chrominance information as a blue waveform. The chrominance information is
overlaid upon the luminance waveform.
You can specify whether the YC Waveform displays both luminance and chrominance information, or just
luminance information. For a video on reading a waveform monitor, see
YC Waveform with the chroma control enabled
A. IRE units B. Luminance (green) waveform C. Chrominance (blue) waveform D. Range of signal components
The YC Waveform has the following controls:
Intensity
Adjusts the brightness of the waveform display. It does not affect the video output signal.
Setup (7.5 IRE)
Displays a waveform that approximates the final analog video output signal. Deselecting this option
displays the digital video information.
Chroma
Displays both chrominance in addition to luminance information. Deselecting this option displays only
the luminance.
See also
Reading a waveform monitor
YCbCr Parade
The YCbCr Parade scope displays waveforms representing levels of the luminance and color difference channels in
the video signal. The waveforms appear in a graph one-after-another, parade-like.
The Intensity control adjusts the brightness of the waveforms. It does not affect the video output signal.
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April 1, 2008