Apple Shake 4 - Manual (Page 634)

634 Chapter 23 Color Correction
Method 3: Using a Mult Node to Correct All Three Channels
Method 2 assumes uniform variation across all three channels, which is probably
wishful thinking. On the other hand, it’s fast and easy. A more accurate approach might
be to feed similar expressions into the RGB channels of a Mult node.
The following expressions are entered into the red, green, and blue parameters of a
Mult node:
(PixelAnalyzer1.area1AverageRed@@1)/PixelAnalyzer1.area1AverageRed
(PixelAnalyzer1.area1AverageGreen@@1)/PixelAnalyzer1.area1AverageGreen
(PixelAnalyzer1.area1AverageBlue@@1)/PixelAnalyzer1.area1AverageBlue
This adjusts each channel according to the PixelAnalyzer node’s analysis of each
channel of frame 1.
PixelAnalyzer Viewer Shelf Controls
The PixelAnalyzer node has the following Viewer shelf controls:
Parameters
The PIxelAnalyzer node has the following parameters:
analysisRange
The frame range over which the analysis is performed.
limitProcessing
When turned on, this button limits image updating to the area inside the analysis
boxes.
areaName
The name of each analysis area you create. The associated parameter names for each
analysis area update whenever the name is changed.
areaAverage
The average value of every pixel within the analysis area over the span of the
analysisRange.
Button Description
Analyze Forward/
Backward Analyzes to beginning or end of a clip. Once you’ve defined the
analysis area, click one of these controls to analyze the image.
Offset From Search
Region Click this button to offset the analysis area from its initial
position.
Path Display Toggle analyze area display.