Apple Shake 4 - Manual (Page 677)

Chapter 23 Color Correction 677
Parameters
This node displays the following controls in the Parameters tab:
width
The width of the PlotScanline. You likely want to set the width to 256 on an 8-bit image
to get one-to-one correspondence.
height
The height of the PlotScanline. You likely want to set the height to 256 on an 8-bit
image to get one-to-one correspondence.
line
The Y-line of the image to be analyzed. On a horizontal ramp, this does not matter, as
they are all identical.
Histogram
The Histogram node is an analysis tool that examines an image and graphs the
occurrence per channel of each value. The X axis of the Histogram corresponds to the
numerical value of a pixel. The Y axis is the percentage of pixels per channel with that
value. The graph has nothing to do with the input pixel’s original X or Y position in
the image.
Note: The Histogram node should not be used inside of macros.
The following are some examples:
Example 1
A 256 x 256 8-bit black-and-white Ramp. Since there are equal amounts of the entire
range of pixels, the result is a solid white field. The orientation of the ramp has no
bearing on the graph.