Secondary Color Correction Primer - The Art and Technique of Digital Color Correction - page 185

Another good image to use for many experiments is this image created by noted
color scientist Bruce Lindbloom. Because there is shading in the image and various levels
of saturation in many different hues, this is a good overall image with which to experi-
ment. This image is also on the DVD (“DeltaE_8bit_gamma2.2.tif”).
Another test image that you can use if you need skin tones or are trying to isolate
things with secondaries is this image from Getty Images. The image is on the DVD as well
(“Getty_Test_Image.jpg”). It is intended for use in setting up printers and doing color
management for Getty Images stock site.
Spot Color Correction (Vignettes or Power Windows)
Another form of secondary color correction is called spot color correc-
tion . In Color, they're known as vignettes; in DaVinci, they're called
Power Windows or Windows ( Figure 5.31 ) . The basic concept is to
draw a shape on the screen and color correct inside or outside of that
shape ( Figure 5.32 ). In the early days of Power Windows, you could use
only geometric shapes—variations on circles and squares. Now, most of
the file-based color correctors like Color and others allow you to draw
custom shapes using Bezier curves or B-spline curves. Many of these
vignettes, windows, or spot correction shapes can also be tracked to the
movement of the shot, which is important in many shots. With some
software, like Resolve, you can also combine these shapes, adding them
or subtracting them from one another, to create complex windows.
Shot movement—whether it's camera movement or movement within
the frame of a locked-down shot—will be a big factor in whether you choose
to use a spot color correction. In the example we did earlier in the chapter of
the lion at the Art Institute, the camera is locked down, the lion doesn't move,
Fig. 5.31 DaVinci Resolve Window tab.