Apple Color 1.0 User Manual
Page 101
Chapter 5
Setup
101
 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.
The broadcast safe settings limit the range of uncorrected source media in your
project, and also prevent you from inadvertently introducing illegal values as you make
corrections. There are three ways you can limit broadcast levels in your program.
Turn Broadcast Safe On, and Work with It Turned On the Whole Time
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 through 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 then you prefer, you can make a correction to adjust the signal.
Turn Broadcast Safe Off While You Correct, Then Turn It Back On for Output
If you turn Broadcast Safe on right away, illegal portions of the signal are limited
immediately, 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 a good idea to turn the Broadcast Safe
settings off while you do your initial color correction pass, so that 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.
Once you’ve finished with your initial pass, you can turn Broadcast Safe back on to
prevent stray levels, and you’ll have confidence that you’re not limiting the image
too much.
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. 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 “