# Hidden crop when GROW from seeds tool is applied (Segment Editor Module)

**URL:** <https://discourse.slicer.org/t/hidden-crop-when-grow-from-seeds-tool-is-applied-segment-editor-module/17793>\
**Category:** Support\
**Tags:** segmentation\
**Created:** [May 25, 2021, 3:26pm UTC](https://discourse.slicer.org/t/hidden-crop-when-grow-from-seeds-tool-is-applied-segment-editor-module/17793 "2021-05-25T15:26:25Z")\
**Posts on this page:** 1\
**Showing post:** 6

<div class="post-metadata">

**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [May 28, 2021, 7:48pm UTC](https://discourse.slicer.org/t/hidden-crop-when-grow-from-seeds-tool-is-applied-segment-editor-module/17793/6 "2021-05-28T19:48:20Z")

</div>

You can modify `extentGrowthRatio` to add a larger margin around the seeds. If you specify a very large value then it will always include the entire volume. For example, if you use the Segment editor module:

```python
gfs = slicer.modules.SegmentEditorWidget.editor.effectByName('Grow from seeds').self()
gfs.extentGrowthRatio = 10000

```

You may also try Local threshold effect, which takes care of the extent (it uses whatever large extent is needed), allows setting the threshold range in the same tool (you draw a small region to specify the threshold range, then you get the complete segmentation with a single Ctrl-click):

> [@New Segment Editor effect: Local threshold](https://discourse.slicer.org/t/new-segment-editor-effect-local-threshold/9233):
>
> Local threshold, a new semi-automatic segmentation method, has been added to the Segment Editor. It is available in both the 4.11.0 and 4.10.2 releases through the SegmentEditorExtraEffects extension. This effect adds connected voxels to segments that are within a specified threshold, and attempts to prevent leaks into other structures through small connecting regions. The result is similar to that of the “Level trace” effect in that it delineates a region within a certain threshold value, howev…

---

_[View the full topic](https://discourse.slicer.org/t/hidden-crop-when-grow-from-seeds-tool-is-applied-segment-editor-module/17793)._