You may want to use this format when your algorithm process image computations using floating point arithmetic (continuous scheme). You may also use this format to represent any kind of two-dimensional real data (such as matrix).

Notice that you may lose precision when you use such format as the input
of another module which requires integer representation (`Cimage `type), e.g.
printing or displaying devices.
In the other side, a module which accepts `Fimage `type as the input will also
work without degradation if you put a `Cimage `type instead.
It is so better to use, if possible, `Cimage `type for output variables and `Fimage `type for input.

mw 2004-05-05