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Showing content from http://libvips.github.io/libvips/API/current/ctor.Image.mask_butterworth_ring.html below:

Vips.Image.mask_butterworth_ring

int
vips_mask_butterworth_ring (
  VipsImage** out,
  int width,
  int height,
  double order,
  double frequency_cutoff,
  double amplitude_cutoff,
  double ringwidth,
  ...
)

Make a butterworth ring-pass or ring-reject filter, that is, one with a variable, smooth transition positioned at frequency_cutoff of width width, where frequency_cutoff is in the range 0 - 1.

The shape of the curve is controlled by order — higher values give a sharper transition. See Gonzalez and Wintz, Digital Image Processing, 1987.

Optional arguments

• nodc: gboolean, don’t set the DC pixel
• reject: gboolean, invert the filter sense
• optical: gboolean, coordinates in optical space
• uchar: gboolean, output a uchar image

This constructor is not directly available to language bindings.

out

Type: VipsImage

Output image.

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

width

Type: int

Image size.

height

Type: int

Image size.

order

Type: double

Filter order.

frequency_cutoff

Type: double

Frequency threshold.

amplitude_cutoff

Type: double

Amplitude threshold.

ringwidth

Type: double

Ringwidth.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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