User Manual

Eyedropper (Pick)
Click the Eyedropper icon, also called the Pick button, and select a color from an image in the
display to automatically set control points on the spline for the selected color. The new points
are drawn with a triangular shape and can only be moved vertically (if point is locked, only the
Out value can change).
Points are only added to enabled splines. To add points only on a specific channel, disable the
other channels before making the selection.
One use for this technique is white balancing an image. Use the Pick control to select a pixel
from the image that should be pure gray. Adjust the points that appear so that the Out value is
0.5 to change the pixel colors to gray.
Use the contextual menu’s Locked Pick Points option to unlock points created using the Pick
option, converting them into normal points.
Reference
The Reference section includes controls that handle matching to sample areas of the
connected reference image.
 Match Reference: The Match Reference button adds points on the curve to match an
image connected to the green reference image input. The number of points used to
match the image is based on the Number of Samples slider below.
 Sample Reference: Clicking the Sample Reference button samples the center scanline
of the background image and creates a LUT of its color values. The number of points
used to match the samples scanline is based on the Number of Samples slider below.
 Number of Samples: This slider determines how many points are used to match the
curve to the range in the reference image.
 Show Match Rectangle: Enabling this checkbox displays a rectangle in the viewer
showing the area on the reference image used during the match process. The match
rectangle affects only the result of the Match Reference operation. The Sample
reference is always done from the center scaling of the image.
 Match Center: The X and Y parameters allow you to reposition the match rectangle to
sample a different area when matching.
 Match Width: Width controls the width of the match rectangle.
 Match Height: Heigh controls the height of the match rectangle.
 Pre-Divide/Post-Multiply: Selecting this checkbox causes the image’s pixel values to
be divided by the Alpha values prior to the color correction, and then re-multiplied by
the Alpha value after the correction. This helps to avoid the creation of illegally additive
images, particularly around the edges of a blue/green key or when working with
3D-rendered objects.
Common Controls
Settings Tab
The Settings tab in the Inspector is also duplicated in other Color nodes. These common
controls are described in detail at the end of this chapter in “The Common Controls” section.
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