The Clamp Alpha tool is used to bring the alpha channel of the primary input within a predetermined range. You can use clamp alpha values outside of the [0,1] range in order to prepare the alpha channel for use in compositing operators. This is necessary because Composite does not force alpha values to be in the [0,1] range.

The Clamp Alpha tool contains the following parameters:

• Minimum Alpha Set Largest negative float point. By default, Min is 0.
• Maximum Alpha Set Largest positive float point. By default Max is 1.0.