Table of Contents

## Name

im_rotquad - rotates the four quadrants of an image

## Synopsis

#include <vips/vips.h>

int im_rotquad(in, out)
IMAGE *in, *out;

## Description

im_rotquad rotates the four quadrants of the image held by the image descriptor in and writes the result on the image descriptor out.

The function is used primarily to rotate a fourier transform in such a way that the coordinate (0,0) is near the centre of the image, the so-called optical transform.

The function operates on any input; output has the same format, sizes and bands as input.

## Return Value

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

## See Also

im_fwfft(3) , im_invfft(3) , im_scaleps(3) .

## Copyright

N. Dessipris

## Author

N. Dessipris - 06/07/1990

Table of Contents

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