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

Vips.Image.abs

int
vips_abs (
  VipsImage* in,
  VipsImage** out,
  ...
)

This operation finds the absolute value of an image. It does a copy for unsigned integer types, negate for negative values in signed integer types, fabs() for float types, and calculates modulus for complex types.

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.

...

Type: 

NULL-terminated list of optional named arguments.

Type: int

0 on success, -1 on error.

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