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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


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