Apple Shake 4 - Manual (Page 674)

674 Chapter 23 Color Correction
gHue
Adds green to the hue range you identify.
bSuppress
Removes blue from the hue area you identify when you drag the control point
downward.
bHue
Adds blue to the hue range you identify.
Other Nodes for Image Analysis
The PlotScanline and Histogram nodes, found in the Other tool tab, let you analyze
images from the node tree to better understand how the data is being manipulated.
Note: You can also apply a Histogram or PlotScanline using the viewer scripts.
Using the PlotScanline to Understand Color-Correction Functions
To better understand some of the Shake color-correction nodes, use the Other–
PlotScanline node or the Plotscanline viewer script. The PlotScanline node, located in
the Other Tool tab, looks at a single horizontal scanline of an image and plots the
brightness value of a pixel for each X location.
The most basic example of this is shown in the following illustration. The example
begins with a simple horizontal gradient source image that varies linearly from 0 to 1.
The PlotScanline resolution is set to 256 x 256 (for an 8-bit image).
The ramp ranges from black (on the left) to white (on the right). This is reflected in the
graph as a linear line.