Apple Final Cut Pro 6 - Manual (Page 1292)

26
507
26
Measuring and Setting
Video Levels
Features such as the real-time video scopes and the
Broadcast Safe filter help you precisely analyze and
control video levels to maintain broadcast standards.
This chapter covers the following:
 Components of Video Color (p. 507)
 Measuring Video Levels with the Final Cut Pro Video Scopes (p. 512)
 Preventing Illegal Broadcast Levels (p. 523)
 Working with Analog Video (p. 534)
 Using Color Bars for Video Calibration (p. 540)
Components of Video Color
Before you can effectively perform color correction, you need to understand the
basics of what makes up the image of a video file. Video and graphics files can
represent color information several ways. Traditionally, computer-generated video
uses RGB color encoding, while digital video systems use Y´C
B
C
R
(sometimes known
as YUV video) encoding.
RGB Color Model
In the retina of the eye, there are three kinds of color receptors, called cone cells. The three
kinds of cone cells are sensitive to the short, medium, and long wavelengths of visible
light, respectively. The RGB color model approximates the way human vision encodes
images by using three primary color channels: red, green, and blue. Emitted light sources
such as CRT monitors, flat-panel displays, and video projectors use the RGB color model,
as do image-capturing devices such as video cameras and computers.