Convert image to double precision.
The conversion of img to double precision, is dependent on the type of input image. The following input classes are supported:
The range of values from the class is scaled to the interval [0 1].
True and false values are assigned a value of 0 and 1 respectively.
Values are cast to double.
Returns the same image.
If img is an indexed image, then the second argument should be
the string "indexed". If so, then img must either be
of floating point class, or unsigned integer class and it will simply
be cast to double. If it is an integer class, a +1 offset is applied.
See also: double.
Package: image