The output of any tool can be connected directly to another tool's Effect Mask input. The bitmap mask tool is not required for many common tasks. If the output is connected directly, the common controls tab for the masked tool will display a control to select which channel of the mask image is used to create the mask.
However, bitmap mask tools may still be required to connect to other mask inputs on some tools, such as Garbage Mattes and Pre-Masks. Also, using a bitmap mask tool between the mask source and the target tool provides additional options that would not be available when connecting directly, such as combining masks, blurring the mask or clipping its threshold.
Many of the controls found in this mask tool are common to all mask tools. These controls are documented at Common Mask Controls.
Use this control to select 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).
The Threshold range control can be used to clip the bitmap image. Increasing the value of the low control will clip pixels below the specified value to black (0.0). Decreasing the high value will force pixels higher than the specified value to white (1.0).
This control has no affect unless the input image contains a Material or Object ID channel. When toggled on, the selected object ID and/or material ID is used to create a mask based on the selected object or material. When toggled off, the regular color channels will generate the mask.
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