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

Vips.Image.round

int
vips_round (
  VipsImage* in,
  VipsImage** out,
  VipsOperationRound round,
  ...
)

Round to an integral value.

Copy for integer types, round float and complex types.

The format of out is always the same as in, so you may wish to cast to an integer format afterwards.

This method is not directly available to language bindings.

out

Type: VipsImage

Output VipsImage.

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.

round

Type: VipsOperationRound

VipsOperationRound rounding operation to perform.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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