Table of Contents

## 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

Table of Contents

- Name
- Synopsis
- Description
- Return Value
- See Also
- Copyright
- Author