= swapbytes =
{{{
USAGE:  swapbytes [-h][-b <bytes_per_pixel>] input_file> <output_file>

Swaps bytes of input_file and outputs result to output_file.

Note:
  - Data type of a short (two bytes per pixel) is the default.
  - Supported bytes_per_pixel:  2, 4, and 8
}}}