Plotscanline – Apple Shake 4 User Manual
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Chapter 23
Color Correction
PlotScanline
The PlotScanline node is an analysis tool that examines a line of an image and graphs
the intensity of each channel per X position. It greatly helps to determine what a color-
correction node is doing. Although it can be attached to any image for analysis, it is
often attached to a horizontal Ramp to observe the behavior of a color correction.
Switch the Viewer to view the alpha channel (press A in the Viewer), and see the
behavior of the alpha channel.
The following are some examples of using the PlotScanline node.
Example 1
A 256 x 256 8-bit black-and-white Ramp. Since there is a smooth gradation, with the
center at .5, it is a straight line. Moving the center to .75 pushes the center to the right,
making the entire image darker. This is reflected in the PlotScanline node.
Example 2
In this example, some color-correction nodes are inserted and the values are adjusted.
The PlotScanline indicates exactly what data gets clipped, crunched, compressed, or
confused.