ace sw for writing seq files.
   sw = seqIo( fName, 'writer', info )
 Get info about seq file.
   info = seqIo( fName, 'getInfo' )
 Crop sub-sequence from seq file.
   seqIo( fName, 'crop', tName, frames )
 Extract images from seq file to target directory or array.
   Is = seqIo( fName, 'toImgs', [tDir], [skip], [f0], [f1], [ext] )
 Create seq file from an array or directory of images or from an AVI file.
   seqIo( fName, 'frImgs', info, varargin )
 Convert seq file by applying imgFun(I) to each f