The Cleanup Alpha tool lets you remove gray details from white and/or black regions of the alpha channel. You can choose to remove holes in black regions, white regions, or both. You can specify what range of values is black and what range is white. In addition, you can control the maximum number of pixels of edges to preserve and the softness controlling the blend between the preserved edge region and the interior filled-in region. The specified edge preservation width is considered to be a maximum limit; for instance, when removing holes in white regions, all pixels that are connected to black regions and within the specified distance from black regions will be considered part of the edge and preserved. Essentially the black region fills into the edges until it hits the white region or its maximum width limit, and then this is used as a mask to preserve input values in the filled region.
The Cleanup Alpha tool has the following parameters:
| Use: | To: |
|---|---|
| Enable | Enable the black or white (or both) clean up controls. |
| Edge Width | Control the number of pixels of edges to preserve. |
| Edge Softness | Control the blend between the preserved edge region and the interior filled-in region. |
| White/Black Threshold | Specify black or white (or both) thresholds. |
| Curve | Gesturally manipulate the alpha remapping. |
| Reset | Reset the remapping curve. |
