**fScan Reference Manual, Chapter 2 (CmdLineOptions:Expr): erode**
===== Erode -- Erode edges of an intensity region in a 3D image volume =====

 **usage:  -expr [NREPTS] [static] erode  val maskbits newval flag nmatch nneighbors**

VAL - "Inside" value (or Percent value if (FLAG & (4|8))\\
MASKBITS - voxel data values to consider for comparing with VAL (DATABITS is inverse of MASKBITS)\\
NEWVAL - bit-value to turn on when adding (dilating) a voxel. If NEWVAL is negative and MASKBITS is zero, then the input data voxel value will be used when dilating into neighboring voxels.

FLAG:\\
  * 0 - (default)
  * 1 - 
  * 2 - erode/dilate in 2-D plane only
  * 4 - Stop on dark edge (voxel darker than (100-VAL1)% of inside neighbors (Needs MASKBITS set)
  * 8 - Stop on bright edge (brighter than (100+VAL1)% of inside neighbors

**See Also:**\\
[[jvs:fscan:manual:chapter2:expression:dilate|DILATE]],
[[jvs:fscan:manual:chapter2:expression:flood|FLOOD]],
[[jvs:fscan:manual:chapter3:threshold|THRESHOLD]],
[[jvs:fscan:manual:chapter1:segmentation|Segmentation]]\\

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[[jvs:fscan:manual:chapter2:expression|Expression Command]], 
[[jvs:fscan:manual:help|Manual Help]]