Grain Distance Transform
Compute the mask distance transform using Gwyddion-style interior, exterior, or signed output. Supports Euclidean, city-block, chessboard, and octagonal distance variants, with optional image-boundary handling matching mask_edt.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Field providing physical calibration for the output |
| mask |
IMAGE |
Yes |
Binary mask to compute distances for |
Outputs
| Name |
Type |
Description |
| distance |
DATA_FIELD |
Distance transform field in physical units |
Controls
| Name |
Type |
Default |
Description |
| distance_type |
dropdown |
euclidean |
Distance metric: euclidean, cityblock, chess (Chebyshev), octagonal48, octagonal84, or octagonal |
| output_type |
dropdown |
interior |
Output mode: interior (distances inside grains), exterior (distances outside), or signed (positive inside, negative outside) |
| from_border |
BOOLEAN |
True |
When enabled, image borders are treated as mask boundaries |
Limitations
- Output distances are in physical xy units derived from the field calibration.
- The mask must have the same pixel dimensions as the field.
