20 lines
568 B
Groff
20 lines
568 B
Groff
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.TH IM_SIGN 3 "July 2002"
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.SH NAME
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im_sign \- find the unit vector in the direction of value
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.SH SYNOPSIS
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#include <vips/vips.h>
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int im_sign( in, out )
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.br
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IMAGE *in, *out;
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.SH DESCRIPTION
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.B im_sign(3)
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finds the unit vector in the direction of the pixel value. For non-complex
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images, it returns a signed char image with values -1, 0, and 1 for negative,
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zero and positive pixels. For complex images it returns a
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complex normalised to length 1.
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.SH RETURN VALUE
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The function returns 0 on success and -1 on error.
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.SH SEE ALSO
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im_abs(3), im_cmulnorm(3), im_c2amph(3)
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