Apple Final Cut Pro 7 - Manual (Page 1317)

Displaying Excess Luma and Chroma Levels in the Viewer and
Canvas
The Final Cut Pro range-checking options (in the Range Check submenu of the View
menu) allow you to turn on zebra striping in the Viewer and Canvas to immediately warn
you of areas of your clip’s image that may stray outside the broadcast-legal range. Zebra
stripes appear as animated diagonal “marching lines” that are superimposed over illegal
areas in your picture or areas that are very near the broadcast-legal limits. Additional
icons are displayed to warn you about luma or chroma levels that fall outside the legal
range for broadcast.
Green zebra stripes
indicate luma from
90 to 100 percent.
Red zebra stripes indicate
luma above 100 percent.
Warning icon
Turning on Range Checking
Turning on one of the range-checking options gives you immediate feedback if your clips
have luma or chroma values that are too high for broadcast. These values may be caused
by the way the footage was shot or by filter adjustments that you are making.
To turn on range checking
µ
Choose View > Range Check, then choose an option from the submenu.
The Viewer and Canvas now display zebra stripes whenever illegal levels appear in your
clips.
Options in the Range Check Submenu
You can choose these options from the Range Check submenu of the View menu:
• Excess Luma: If you choose this option, red zebra stripes appear in all areas of the frame
with luma above 100 percent, and green zebra stripes appear in areas of the frame
with luma from 90 to 100 percent. A yellow exclamation point icon indicates luma
that’s too “hot.” A green checkmark indicates that all luma in the picture is legal. An
in-range icon (a green checkmark with an arrow pointed upward) indicates when luma
from 90 to 100 percent is present, with no luma over 100 percent.
• Excess Chroma: When this option is turned on, red zebra stripes appear in areas of the
frame with illegal chroma values. A yellow exclamation point icon indicates chroma
that’s too “hot.” A green checkmark indicates that all chroma in the picture is legal.
1317 Chapter 78 Measuring and Setting Video Levels