im_rotquad3
Rotates the four quadrants of an image
Usage
#include <vips/vips.h>
int im_rotquad(in, out)
IMAGE *in, *out;
Overview
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.
Releases
Unchanged in 4 releases since Debian 3.1 (Sarge).