| TYPE | NAME | DESCRIPTION |
|---|---|---|
| STRING | gradients_callback | The callback PDB proc to call when gradient selection is made |
| STRING | popup_title | Title to give the gradient popup window |
| STRING | initial_gradient | The name of the pattern to set as the first selected |
| INT32 | sample_size | Size of the sample to return when the gradient is changed (0 < sample_size <= 10000) |