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NAME

       im_sign - find the unit vector in the direction of value

SYNOPSIS

       #include <vips/vips.h>

       int im_sign( in, out )
       IMAGE *in, *out;

DESCRIPTION

       im_sign(3)  finds  the unit vector in the direction of the pixel value.
       For non-complex images, it returns a signed char image with values  -1,
       0,  and 1 for negative, zero and positive pixels. For complex images it
       returns a complex normalised to length 1.

RETURN VALUE

       The function returns 0 on success and -1 on error.

SEE ALSO

       im_abs(3), im_cmulnorm(3), im_c2amph(3)

                                   July 2002