Primary Color Correction: Color Control Primer - The Art and Technique of Digital Color Correction - page 101

Using Eyedroppering in Color
To use the eyedropper information in Color, choose 3D Color Space ( Figure 3.37 ) as one of your scope quadrants on
the right screen and choose RGB mode from the buttons on the upper left of the scope. The other choices are HSL,
Y'CbCr, and IPT. These choices affect how the eyedropper information is displayed. RGB is the most useful when
you're manipulating the red, green, and blue controls. Color allows you to select three different points on the image
to track via the eyedroppers. These points are accessed along the bottom of the 3D color space scope. Click on a
square to select it and then drag around on the image. It would make sense to use these three points to track a white
point, black point, and neutral midtone. As the image plays or as you make adjustments to the image, the numbers
to the right of each square update. Many applications provide you with 8- or 10-bit numbers for each color channel,
but in Color, they are provided as decimals with 0 being black and 1.0 being white.
Fig. 3.37
In Apple Color, the eyedropper functionality is in the 3D Vectorscope. Click on the small white, black, and gray
boxes at the bottom, then click or drag on the image in the viewer. The small box will change to the color of the
sampled pixel.
The eyedropper swatches in the 3D Color Space scope match the points on the image.