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

Vips.Image.smartcrop

int
vips_smartcrop (
  VipsImage* in,
  VipsImage** out,
  int width,
  int height,
  ...
)

Crop an image down to a specified width and height by removing boring parts.

Use interesting to pick the method vips uses to decide which bits of the image should be kept.

You can test xoffset / yoffset on out to find the location of the crop within the input image.

Optional arguments

• interesting: VipsInteresting to use to find interesting areas (default: VIPS_INTERESTING_ATTENTION)
• premultiplied: gboolean, input image already has premultiplied alpha
• attention_x: gint, output, horizontal position of attention centre when using attention based cropping
• attention_y: gint, output, vertical position of attention centre when using attention based cropping

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.

width

Type: int

Width of area to extract.

height

Type: int

Height of area to extract.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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