Apple Final Cut Pro 6 - Manual (Page 1303)

518 Part III Color Correction and Video Quality Control
The shape of the Histogram graph is also good for determining the amount of contrast
in an image. A low-contrast image has few pixels in the extreme black and white
ranges, so the Histogram shows a concentrated clump of values nearer to the center of
the graph. By comparison, a high-contrast image has a wider distribution of values
across the entire width of the Histogram and may have spikes at white and black.
Learning to Read the RGB Parade Scope
The RGB Parade scope is like three side-by-side waveform monitors that display your
video as three separate red, green, and blue components. The waveforms are tinted
red, green, and blue so you can easily identify them.
Low-contrast image High-contrast image
High blue levels