1.5

• Phase: Lets you adjust the phase of the chroma. If Amplitude is set to 0, no change
is made.
• Offset: Lets you adjust the offset of a chroma adjustment. If Amplitude is set to 0, no
change is made.
• Chroma Limit: Sets the maximum allowable saturation. The chroma of signals with
saturation above this limit will be limited to match this maximum value.
• Composite Limit: Sets the maximum allowable combination of luma and chroma.
Signals exceeding this limit will be limited to match this maximum value.
Ways of Using Broadcast Safe
The Broadcast Safe parameters can be set to match the required QC guidelines for your
program. When enabled, they guarantee that your program will not exceed these
standards while you monitor your program and when you render the finally corrected
media. There are three ways you can limit broadcast levels in your program.
Turn Broadcast Safe On, and Leave It Turned On While You Make Your Adjustments
The safest way to work (and the default behavior of new projects) is to simply turn
Broadcast Safe on at the beginning of your work, and leave it on throughout your entire
color correction pass. With practice, you can tell if a highlight or shadow is being crushed
too much by looking at the image on the monitor and watching for clumping exhibited
at the top and bottom of the graphs in the Waveform scope. If the image is being clipped
more than you prefer, you can make a correction to adjust the signal.
Turn Broadcast Safe Off While Making an Adjustment, Then Turn It Back On to Render
Output
If you leave Broadcast Safe on, illegal portions of the signal are always limited, and it
can be difficult to see exactly how much data is being clipped. When you're color
correcting media that was consistently recorded with super-white levels and high
chroma, you may find that it's sometimes a good idea to turn the Broadcast Safe settings
off while you do an initial color correction pass, so you can more easily see which parts
of the signal are out of bounds and make more careful judgments about how you want
to legalize it.
Turn Enable Clipping On for Individual Shots in Your Program
The Enable Clipping button in the Basic tab of the Primary Out room lets you set ceiling
values for the red, green, and blue channels for individual shots in your program (RGB
clipping). This lets you prevent illegal broadcast values in shots to which you're applying
extreme primary, secondary, or Color FX corrections, without turning on Broadcast Safe
for the entire program. If Enable Clipping and Broadcast Safe are both on, the lowest
standard is applied. For more information, see Ceiling Controls.
134 Chapter 5 Configuring the Setup Room