Apple Final Cut Pro 6 - Manual (Page 1314)

Chapter 26 Measuring and Setting Video Levels 529
III
About Custom Luminance Limiting
and Custom Saturation Limiting Controls
The following section gives some examples to show how the Custom Luminance
Limiting and Custom Saturation Limiting controls in the Broadcast Safe filter work.
In the following example, Max. Output parameter values between 95 and 105 are
compressed down to the range between 95 and 100. The shape of the waveform
is preserved.
In the next diagram, values above 100 are clamped, removing details above a value of
100. In this case, the Max. Output parameter has no effect because its value is identical
to that of the Clamp Above parameter.
In the following diagram, the Clamp Above parameter removes details above a value of
100. Then, the Max. Output parameter compresses the clamped values between 90 and
100 to the range between 90 and 95.
105
100
95
90
85
Clamp Above = 105 Max. Output = 100
Max. Output
Start (Threshold) = 95
Start (Threshold) Clamp Above
105
100
95
90
85
Start (Threshold) = 95 Clamp Above = 100 Max. Output = 100
Max. Output Start (Threshold) Clamp Above
105
100
95
90
85
Start (Threshold) = 90 Clamp Above = 100 Max. Output = 95
Max. Output Start (Threshold) Clamp Above