Apple Shake 4 Tutorials - Manual (Page 97)

Chapter 3 Depth Compositing 97
The real Z values are placed into the alpha channel for analysis. The inverted display is a
result of the Alpha channel view.
6 Click a pixel or drag over the image to display the Z distance value at the top of the
Viewer, shown as the “alpha” value.
When the View Z script is active, you can use the Pixel Analyzer to get the minimum
and maximum values in terms of distance.
7 Click the Pixel Analyzer tab (in the row of tabs beneath the Node View).
The Pixel Analyzer opens.
8 Set Mode to Image, to analyze all displayed pixels, then click the Maximum color control.
The maximum distance value is displayed in the Alpha channel field. Click any of the
other Value Range options to change the display range (for example, 0-255, 0-1023, and
so on).
9 Click the Minimum color control to display the minimum distance value in the Alpha
channel field.