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IM_ZONE

IM_ZONE

Section: C Library Functions (3) Updated: 10 May 1991
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NAME

im_zone, im_fzone - creates a zone plate  

SYNOPSIS

#include <vips/vips.h>

int im_zone(image, size)
IMAGE *image;
int size;

int im_fzone(image, size)
IMAGE *image;
int size;

 

DESCRIPTION

im_fzone() creates a float one band image of a zone plate of size size by size. Pels are in the range [-1,+1]. The zone plate has spatial frequencies increasing from 0 the center (at size/2, size/2) up to infinity at the edges. size must be positive and even.

im_zone() behaves exactly as im_fzone(), but writes a FMTUCHAR image scaled to the range 0-255.

 

RETURN VALUE

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

SEE ALSO

im_grey(3), im_fgrey(3).  

COPYRIGHT

N. Dessipris  

AUTHOR

N. Dessipris - 10/05/1991


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
SEE ALSO
COPYRIGHT
AUTHOR

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