Apple Final Cut Pro 7 - Manual (Page 1322)

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.
Start (Threshold) Clamp Above Max. Output
105
100
95
90
85
Start (Threshold) = 90 Clamp Above = 100 Max. Output = 95
In the following example, the Clamp Above parameter removes details above a value of
100. Then, the Max. Output parameter compresses the clamped values between 90 and
100 down to 90, resulting in a signal that is clamped at a value of 90.
105
100
95
90
85
Start (Threshold) = 90
Start (Threshold) Clamp Above Max. Output
Clamp Above = 100 Max. Output = 90
Applying the Broadcast Safe Filter to Nested Sequences
The Broadcast Safe filter should always be the last filter applied to a clip to make sure
other filters that can cause illegal values are corrected. However, in some cases, illegal
values may be generated because of the order in which video is processed in Final Cut Pro.
Here are the video processing steps, in order:
• Filters (filters that appear at the top of the Filters tab in the Viewer are processed first,
followed by filters that appear later)
• Motion parameters such as Scale and Rotation and attributes such as Crop and Distort
• Transitions between two clips in a track
• Compositing modes that blend one or more video clip items together
• Filters applied to the entire sequence (achieved by nesting a sequence and then
applying a filter to it)
1322 Chapter 78 Measuring and Setting Video Levels