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

Vips.Image.mask_gaussian_band

int
vips_mask_gaussian_band (
  VipsImage** out,
  int width,
  int height,
  double frequency_cutoff_x,
  double frequency_cutoff_y,
  double radius,
  double amplitude_cutoff,
  ...
)

Make a gaussian band-pass or band-reject filter, that is, one with a variable, smooth transition positioned at frequency_cutoff_x, frequency_cutoff_y, of radius radius.

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.

frequency_cutoff_x

Type: double

Band position.

frequency_cutoff_y

Type: double

Band position.

radius

Type: double

Band radius.

amplitude_cutoff

Type: double

Amplitude threshold.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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