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

Vips.Image.extract_band

int
vips_extract_band (
  VipsImage* in,
  VipsImage** out,
  int band,
  ...
)

Extract a band or bands from an image. Extracting out of range is an error.

n defaults to 1.

Optional arguments

• n: gint, number of bands to extract

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.

band

Type: int

Index of first band to extract.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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