Apple Final Cut Pro 6 - Manual (Page 1311)

526 Part III Color Correction and Video Quality Control
Using the Broadcast Safe Filter
The Broadcast Safe filter provides a quick way to reduce luma and chroma levels that
exceed the broadcast limits for NTSC, PAL, and HD video.
The easiest way to use the Broadcast Safe filter is by choosing one of the presets in the
filter’s Luma/Chroma Mode pop-up menu. The presets provide varying degrees of luma
and chroma limiting depending on the tolerance of your broadcast facility. For more
precise control, you can use the Custom preset to manually adjust the luma and
chroma saturation limits. You can also use the RGB Limiting controls to ensure that your
video levels are acceptable when converted to RGB color (for example, when your
video is displayed on a CRT monitor).
Broadcast Safe Filter Controls
The following section describes controls in the Broadcast Safe filter.
Clamping and Clipping
The Broadcast Safe filter and the RGB Limit filter (see “ Using the RGB Limit Filter ” on
page 531) use clamping to adjust all values above or below a certain threshold to the
threshold level. Clamping creates a waveform whose top or bottom appears flat,
or clipped.
Clipping usually refers to signals that have been negatively affected by in-camera
underexposure or overexposure, color space conversion, or improper use of color
correction tools. When you shoot video, you should control your exposure to avoid
clipping. It’s best to start with a signal that doesn’t have clipping and then clamp
extreme levels as needed using a color correction filter.
Custom Luminance
Limiting controls
Custom Saturation
Limiting controls
Luma/Chroma Mode
pop-up menu
RGB Limiting controls