Apple Shake 4 - Manual (Page 675)

Chapter 23 Color Correction 675
When a node such as ContrastLum is inserted above the PlotScanline node, you can
begin to understand the node. In the ContrastLum node, value is set to 1.5 and the
center and softClip parameters are adjusted.
The effect on the ramp is reflected in the plot.
This also works for non-color correctors, and makes it an interesting analysis tool for the
Filter–Grain or Warp–Randomize node.
PlotScanline and Histogram Viewer Scripts
You can also use the PlotScanline and Histogram viewer scripts to observe image
data, but these are applied directly on your image. To load the parameters, right-click
the Viewer Script button, then choose a Load Viewer Script Controls option from the
shortcut menu.