svn co https://svn.janelia.org/penglab/projects/vaa3d_tools/released_plugins/v3d_plugins/datatype_cnvrt

   Usage : v3d -x datatypeconvert -f dtc -i <inimg_file> -o <outimg_file> -p <tar_dt>

      tar_dt   datatype to be converted to: 1 for V3D_UINT8, 2 for V3D_UINT16, 4 for V3D_FLOAT32

   e.g. v3d -x datatypeconvert -f dtc -i input.raw -o output.raw -p 1