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Selection / Extract sub-image

To select sub-image use two tools:
  • Z - Set Slices Range Tool (double slider under 2D view)
  • X and Y - Rectangular Selection Tool2D view's lower panel [1]. Select with rectangle in 2D view
[1] Rectangle tool is active in default mouse mode.

Extract image   Filters->Extract selection
Apply as mask    Mask->Selection to mask and apply
Create mask   Mask->Selection to mask