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

Vips.Image.shrinkh

int
vips_shrinkh (
  VipsImage* in,
  VipsImage** out,
  int hshrink,
  ...
)

Shrink in horizontally by an integer factor. Each pixel in the output is the average of the corresponding line of hshrink pixels in the input.

This is a very low-level operation: see vips_resize() for a more convenient way to resize images.

This operation does not change xres or yres. The image resolution needs to be updated by the application.

Optional arguments

• ceil: gboolean, round-up output dimensions

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.

hshrink

Type: int

Horizontal shrink.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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