1.5

These curves work much differently than the curves controls of the Primary In room. Each
of the secondary curves controls defaults to a flat horizontal line running halfway through
the graph area.
The visible spectrum is represented along the surface of the curve by a wrap-around
gradient, the ends of which wrap around to the other side of the curve. The control points
at the left and right of this curve are linked, so that moving one moves the other, to
ensure a smooth transition if you make any adjustments to red, which wraps around the
end of the curve.
Tip: If you’re having a hard time identifying the portion of curve that affects the part of
the image you want to adjust, you can use the color swatches in the 3D scopes to sample
a pixel from the preview, and a horizontal indicator will show the point on the curve that
corresponds to the sampled value. For more information, see Sampling Color for Analysis.
Adding points to the surface of this curve lets you define regions of hue that you want
to adjust. Raising the curve in these regions increases the value of the particular aspect
of color that’s modified by a specific curve, while lowering the curve decreases the value.
279Chapter 10 The Secondaries Room