ConvertImagePixelType - part of ANTS registration suite
ConvertImagePixelType infile.nii out.ext TYPE-OPTION
ext is the extension you want, e.g. tif. TYPE-OPTION : TYPE
0 : char
1 : unsigned char
2 : short
3 : unsigned short
4 : int
5 : unsigned int
Note that some pixel types are not supported by some image formats.
int is not supported by jpg.
You can easily extend this for other pixel types with a few
lines of code and adding usage info. The image intensity will
be scaled to the dynamic range of the pixel type. E.g. uchar =>
0 (min), 255 (max).