Apple Color 1.5 - Manual (Page 188)

To produce the overall analysis of the image, the individual graphs for each line of the
image are superimposed over one another.
Because the waveform’s values are plotted in the same horizontal position as the portion
of the image that’s analyzed, the waveform mirrors the image to a certain extent. This
can be seen if a subject moves from left to right in an image while the waveform is playing
in real time.
With all the waveform-style scopes, high luma or chroma levels show up as spikes on the
waveform, while low levels show up as dips. This makes it easy to read the measured
levels of highlights or shadows in the image.
Changing the Graticule Values
The Waveform Monitor is the only scope in which you can change the numeric values
used to measure the signal. By default, the Waveform Monitor is set to measure in IRE,
but you can also switch the scope to measure using millivolts (mV) instead by clicking
one of the buttons to the right of the waveform selection buttons.
188 Chapter 8 Analyzing Signals Using the Video Scopes