Anycase a letter-size image ad 200 dpi does not require more than 0.5 MB of memory, and today
it is actually a very small amount of memory.
The experience demonstrates that allocating 0.1% more than the strictly requested amount of
memory will avoid many errors that might derive from the decompression of the final bytes
of the coded data. Don't forget to allocate this extra bytes before calling
FFDec.