Apple Shake 4 - Manual (Page 629)

Chapter 23 Color Correction 629
Using the Pixel Analyzer Tab to Set Levels
The following example shows you how the Pixel Analyzer can be used to perform a
similar operation to that of the Auto Levels command in Adobe Photoshop. This method
works by using the Pixel Analyzer to automatically find the lowest and highest values in
each channel of an image. You can then assign these values to an Expand node in order
to push the lowest values to 0 (black), and the highest values to 1 (white). In this
example, you can see the effect clearly in the landscape under the clouds.
To set levels using the Pixel Analyzer:
1 Read in an image using a FileIn node, then attach a Color–Expand node to it.
2 Click the left side of the FileIn node to load the image into the Viewer, then click the
right side of the Expand node to load its parameters into the Parameters tab.
3 Open the Pixel Analyzer tab.
4 Switch to Image mode.
The Current, Minimum, Average, and Maximum values of the image in the Viewer
appear in the color swatches at the top of the window.
Cloud images © 2004 M. Gisborne