Vips.Image.gamma

### Method

# Vips Imagegamma

#### Declaration [src]

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

#### Description [src]

Calculate `in` ** (1 / `exponent`), normalising to the maximum range of the input type. For float types use 1.0 as the maximum.

Optional arguments

- `exponent`: `gdouble`, gamma, default 1.0 / 2.4

See also

`vips_identity()`, `vips_pow_const1()`, `vips_maplut()`.

This method is not directly available to language bindings.

#### Parameters

`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.

`...`

  Type: ``

  `NULL`-terminated list of optional named arguments.

#### Return value

Type: `int`

0 on success, -1 on error.