Apple Final Cut Pro 7 - Manual (Page 1309)

The color targets of the Vectorscope scale match the colors in the color balance controls
of the Final Cut Pro color correction filters. If the hues of two shots you’re trying to match
don’t match, the direction and distance of their offset on the Vectorscope scale give you
an indication of which direction to move the color balance indicator to correct for this.
The Vectorscope is also helpful for identifying and correcting the flesh tones of actors in
a shot. When recorded to videotape and measured on a vectorscope, the hues of human
flesh tones, regardless of race, fall along a fairly narrow range (although the saturation
and brightness will vary). This range is identified by a special target line that indicates
the average hue of flesh tones. When there’s an actor in a shot, you’ll know whether or
not the flesh tones are reproducing accurately by checking to see if there’s an area of
color that falls loosely around the Flesh Tone line.
Flesh tones are clustered
about the Flesh Tone line.
As in the previous
image, flesh tones
appear around the
Flesh Tone line.
If the flesh tones of your actors are noticeably off, the offset between flesh colors on the
Vectorscope and the Flesh Tone line will give you an idea of how much to change the
hue to make the correction.
1309 Chapter 78 Measuring and Setting Video Levels