Apple Shake 4 - Manual (Page 476)

476 Chapter 17 Layered Photoshop Files and the MultiLayer Node
Photoshop Layer Opacity
To change the opacity of a layer, expand the subtree for the layer and set the opacity
parameter to a value between 0 and 1. By default, the layer opacity is set to 1. A layer
that is set to a Photoshop transfer mode contains an additional opacity control—the
PSOpacity parameter.
This additional opacity control is necessary because Photoshop and Shake handle
transparency differently. Photoshop’s transparency setting works by varying the
intensity of the alpha channel on the foreground image (prior to the blending
operation). In Shake, the opacity setting on each layer of the MultiLayer node varies the
intensity of all channels (RGBA). The results can differ between the two methods,
depending on the selected blend mode and the way it uses color. The default
PSOpacity setting is the opacity of the layer as set in Photoshop.
Note: To view the name of the Photoshop file, click the right side of a FileIn (Photoshop
layer) node to display the FileIn parameters. In the Source tab, the name of the
imported Photoshop file is displayed in the imageName parameter.
Supported Photoshop Transfer Modes
The layer modes listed in the following table are accessed within the MultiLayer node.
Note: The true math of the Photoshop transfer modes is the proprietary information of
Adobe Systems Incorporated. As a result, the descriptions listed are not guaranteed to
be technically accurate.
Photoshop mode opacity
Shake layer
opacity
Layer Function Description
ColorBurn Takes the color of the second image and darkens the first image by
increasing contrast. White in the second image has no effect on the first
image.
ColorDodge The opposite of ColorBurn, this lightens the image. Black in the second
image does not affect the first image.
Darken Identical to Min, taking the lower pixel value.