**fScan Reference Manual, Chapter 2 (CmdLineOptions:expr): flood**
===== Flood -- Flood fill an intensity region starting from a seed point in a 3D image volume =====

 **usage:  -expr flood flag value range fillvalue datamask**\\

  The FLAG argument controls options.  Combine options by adding values.
  
	FLAG values:
            0 - use current cursor location as seed loc. (default)
            1 - use origin (0,0,0) of region as seed loc.
            2 - use center of region as seed loc.
            4 - start at seed, then find nearest VALUE (or VALUE-RANGE) voxel
          010 - Binary: treat VALUE and RANGE as bit values
          020 - assume a 2-bit mask; otherwise 1 bit
          040 - use highest data bit(s) as mask (default is lowest)
         0100 - Inverse: flood values that DON'T match VAL/RANGE
         0200 - RANGE value is relative to neighbor (+- RANGE intensity)
         0400 - RANGE value is % relative to neighbor (+- RANGE %)
        01000 - don't include edges (voxels touching outside voxels)
        02000 - set edge voxels to FILL_EDGE value (2)
        04000 - only flood in the seed plane (default is 3-D volume)
  
  Values to flood depend on FLAG, VALUE, & RANGE.
  If (FLAG & BINARY):
        VALUE:  value to flood
        RANGE:  mask of bits to consider when looking for VAL
  
  Otherwise:
        VALUE:  threshold value (default = 1) 
        RANGE: > 0, neighbors must be within RANGE % of VALUE to be filled
               < 0, neighbors must be within -RANGE of VALUE to be filled
               = 0, neighbors must match VALUE to be filled
  
  Values being flooded will be replaced with the original value, masked by
  DATAMASK and OR'd with FILLVALUE.
  If FILLVALUE was not specified, it will be set to:
  
  If DATAMASK was not specified, it will be set to:
  
  
  For binary masked data:
        data bit 0 (1's) - ON/OFF
        data bit 1 (2's) - FILLED/not FILLED (or INTERIOR/not INTERIOR)
        data bit 2 (4's) - EDGE/not EDGE
  
  
        ROINUM - if this is a BLOCK ROI, filling is only done within the ROI
        SEEDLOC - XYZ location from which to start filling
                  If SEEDLOC == 0, the seed locations is determined by the FLAG value 
        T0 - which volume to use (if nt > 1)
  
**See Also:**\\
[[jvs:fscan|fScan Home]], 
[[jvs:fscan:manual|fScan Manual]], 
[[jvs:fscan:manual:chapter2|CmdLineOptions]], 
[[jvs:fscan:manual:chapter2:expression|Expression Command]], 
[[jvs:fscan:manual:help|Manual Help]]