This class holds the decomposition type to be used in each part of the
image; the default one, the component specific ones, the tile default ones
and the component-tile specific ones.
Constructs a 'WTFilterSpec' object, initializing all the components and
tiles to the 'FILTER_SPEC_MAIN_DEF' spec type, for the specified number
of components and tiles.
ID for the PACKET (as defined in JPEG 2000) wavelet tree
decomposition (2 levels of decomposition in the high bands and
some specified number for the lowest LL band): 0x01.
ID for the SPACL (as defined in JPEG 2000) wavelet tree
decomposition (1 level of decomposition in the high bands and
some specified number for the lowest LL band): 0x02.