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Showing content from http://libvips.github.io/libvips/API/current/method.Image.invfft.html below:

Vips.Image.invfft

int
vips_invfft (
  VipsImage* in,
  VipsImage** out,
  ...
)

Transform an image from Fourier space to real space.

The result is complex. If you are OK with a real result, set real, it’s quicker.

VIPS uses the fftw Fourier Transform library. If this library was not available when VIPS was configured, these functions will fail.

Optional arguments

• real: gboolean, only output the real part

This method is not directly available to language bindings.

out

Type: VipsImage

Output image.

The argument will be set by the function. The caller of the method takes ownership of the returned data, and is responsible for freeing it.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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