Apple Color 1.5 - Manual (Page 223)

If you examine an image with a color cast in the Waveform Monitor set to Parade, you
can often see the disproportionate levels of each channel that cause the color cast when
you examine the tops of the waveforms (representing the highlights) and the bottoms
of the waveforms (representing the shadows).
Note: For clarity, the Parade scope is shown with the tinted red, green, and blue waveforms
that appear when Monochrome Scopes is turned off in the User Prefs tab.
When Is a Color Cast a Creative Look?
It's important to bear in mind that color casts aren't always bad things. In particular, if
the director of photography is being creative with the lighting, there may in fact be
color casts throughout the tonal range of the image. It's important to distinguish between
color casts that are there either accidentally or because of conditions of the shoot and
the stylistic choices made when lighting each scene. In all cases, clear communication
between the director of photography and the colorist is essential.
223 Chapter 9 The Primary In Room