Adobe 25520388 User Guide - Page 136

USING ADOBE PREMIERE PRO 131 Monitoring assets Vectorscope The Vectorscope displays a circular chart, similar to a color wheel, that shows the video's chrominance information. Saturation is measured from the center of the chart outward. Saturated, vivid colors produce a pattern some distance from the center of the chart, while a black-and-white image produces only a dot at the center of the chart. The particular color, or hue, of the image determines the direction (angle of the pattern). Small target boxes indicate where fully saturated magenta, blue, cyan, green, yellow, and red (present in a color bars test pattern) should appear. In NTSC video, chrominance levels should not exceed these target areas. AB Vectorscope A. Target boxes B. Image profile The Vectorscope has the following controls: Intensity Adjusts the brightness of the pattern display. It does not affect the video output signal. 75% Default position. Use to check video input in which standard 75% intensity bars, like those in Premiere Pro, are used. 100% Shows the entire range of video signal chrominance. Use with video input containing 100% intensity bars. More Help topics "Color Correction effects" on page 352 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 www.adobe.com/go/vid0238. Last updated 1/16/2012