1IM_SIGN(3)                 Library Functions Manual                 IM_SIGN(3)
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NAME

6       im_sign - find the unit vector in the direction of value
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SYNOPSIS

9       #include <vips/vips.h>
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11       int im_sign( in, out )
12       IMAGE *in, *out;
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DESCRIPTION

15       im_sign(3)  finds  the unit vector in the direction of the pixel value.
16       For non-complex images, it returns a signed char image with values  -1,
17       0,  and 1 for negative, zero and positive pixels. For complex images it
18       returns a complex normalised to length 1.
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RETURN VALUE

21       The function returns 0 on success and -1 on error.
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SEE ALSO

24       im_abs(3), im_cmulnorm(3), im_c2amph(3)
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28                                   July 2002                        IM_SIGN(3)