< in fact is a imAttribTable, but we hide this here
< number of bpp to unpack/pack to/from 1 byte. When reading converts n packed bits to 1 byte (unpack). If n>1 will also expand to 0-255. When writing converts 1 byte to 1 bit (pack). If negative will only expand to 0-255 (no unpack or pack).
< used for line conversion, contains all components if packed, or only one if not
< total allocated so far
< extra bytes to be allocated
< flag to switch the original data type: char-byte, short-ushort, uint-int, double-float
\brief Image File Structure (SDK Use Only) * * \par * Base container to hold format independent state variables. * \ingroup filesdk