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720Final Cut Pro User Guide
The vectorscope shows you at a glance the hue and intensity of the various colors in your
image. After you learn to identify the colors in your clips using the vectorscope, you can
more easily see where two images differ and correct them so that they match as closely as
possible.
The Scope menu in the upper-right corner of the vectorscope provides a variety of
display options:
• 100%: Sets the reference chroma level for the color bar targets (the squares
representing each color in a standard color bar test signal) at 100 percent saturated
chroma. Use this when your source media uses 100 percent color bars as its reference.
• 133%: Sets the reference chroma level for the color bar targets at 75 percent saturated
chroma. Use this when your source media uses 75 percent color bars as its reference.
• Vector: Uses a normal chroma hue reference, with red near the top.
• Mark3: Uses a 90-degree rotated chroma hue reference, with red on the right side.
• Show/Hide Skin Tone Indicator: Shows or hides the diagonal line that represents the
human skin tone chroma phase, which is between the yellow and red color bar targets.
Histogram display options in Final Cut Pro
The histogram provides a statistical analysis of the image by calculating the total number
of pixels of each color or luma level and creating a graph that shows the number of
pixels at each percentage of luma or color. Each increment of the scale from left to right
represents a percentage of luma or color, and the height of each segment of the histogram
graph shows the number of pixels that correspond to that percentage.
The Scope menu in the upper-right corner of the histogram provides a variety of display
options:
• Luma: Shows only the luma component of the video. The height of the graph at each
step on the scale represents the number of pixels in the image at that percentage of
luma, relative to all the other values. For example, if an image has few highlights, the
histogram shows a large cluster of values in the midtones.