Apple Color 1.0 - Manual (Page 206)

206 Chapter 9 Primary In
Also unique is the way in which adjustments are made. To emulate the nature of the
filters employed by these kinds of machines, raising a parameter such as the Printer
Points Red parameter doesn’t actually boost the red; instead, it removes red, causing
the image to shift to cyan (the secondary of green and blue). To increase red, you
actually need to decrease the Printer Points Red parameter.
Increasing or decreasing all three printer points parameters together darkens the
image (by raising all three parameters) or lightens it (by lowering all three parameters).
Making disproportionate adjustments to the three channels changes the color balance
of the image relative to the adjustment, altering the color of the image and allowing
for the correction or introduction of color casts.
The Printer Points Parameters
 Printer Points Calibration: This value calibrates the printer points system according to
the film gamma standard you wish to use. The default value of 7.8 is derived by
multiplying the value 12 (points per ƒ-stop) by a value of 0.65 (the default film
gamma standard used). 0.65 * 12 = 7.8. To recalibrate for a different film gamma
value, insert your own gamma value into the equation.
 Printer Points Red: The value with which to raise or lower the red channel.
 Printer Points Green: The value with which to raise or lower the green channel.
 Printer Points Blue: The value with which to raise or lower the blue channel.
Note: There is also a printer points node available in the Color FX room, which works
identically to the parameters covered in this section.
Auto Balance
The Auto Balance button performs an automatic analysis of the current shot, based on
the frame at the position of the playhead. This is useful for quickly bringing a problem
shot with an inobvious color cast to a neutral state, prior to performing further color
correction.
When you click this button, Color automatically samples the darkest and lightest five
percent of the image, and the most neutral midtone pixels falling between the two, in
order to determine how to make shadow, midtone, and highlight adjustments to
neutralize any available color casts in the image. In addition, image contrast is
maximized to occupy the widest available range from 0 to 100.
Note: Unlike the Auto Balance controls in the Final Cut Pro Color Corrector 3-way filter,
the Auto Balance command is fully automatic, and does not require you to select
individual areas of the image for analysis.