Apple Color 1.0 - Manual (Page 151)

Chapter 8 Video Scopes 151
Chroma
This scope shows the combined C
B
and C
R
color-difference components of the image.
It’s useful for checking whether or not the overall chroma is too high, and also whether
it’s being limited too much, as it lets you see the result of the Chroma Limit setting
being imposed when Broadcast Safe is enabled.
For example, the following graph shows extremely saturated chroma within the image:
When you turn Broadcast Safe on with the default Chroma Limit value of 50, you can
see that the high chroma spikes have been limited to 50.
Y’C
B
C
R
This scope shows the individual components of the Y´C
B
C
R
encoded signal in a parade
view. The leftmost waveform is the luma (Y’) component, the middle waveform is the
C
B
color difference component, and the rightmost waveform is the C
R
color difference
component.