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– Height: The image source will be scaled uniformly until its height (Y) fits the height of the mask.
Depending on the relative dimensions of the image source and mask, the image source’s
X-dimension might not fit the mask’s X-dimension, resulting in either cropping of the image source
in X or the image source not covering the mask’s width entirely.
– Outside: The image source will be scaled uniformly until one of its dimensions (X or Y) fits the
outside dimensions of the mask. Depending on the relative dimensions of the image source
and mask, either the image source’s width or height may be cropped or not fit the respective
dimension of the mask.
Center X and Y
These controls adjust the position of the Bitmap mask.
Channel
The Channel menu determines the Channel of the input image used to create the mask. Choices
include the red, green, blue, and alpha channels, the hue, luminance, or saturation values, or the
auxiliary coverage channel of the input image (if one is provided).
Threshold Low/High
The Threshold range control can be used to clip the bitmap image. Increasing the low range control
will clip pixels below the specified value to black (0.0). Decreasing the high range control will force
pixels higher than the specified value to white (1.0).
Use Object/Use Material
This control has no effect unless the input image contains a Material or Object ID channel. When
toggled on, the Object ID and Material ID are used to create a mask based on the selected object or
material. When toggled off, the regular color channels will generate the mask.
Common Controls
Image and Settings Tabs
The Image and Settings tabs in the Inspector are also duplicated in other Mask nodes. These common
controls are described in detail at the end of this chapter in “The Common Controls” section.
Chapter 106Mask Nodes 2033
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