Function

Bablspace_get_rgb_luminance

Declaration [src] 

void
babl_space_get_rgb_luminance (
  const Babl* space,
  double* red_luminance,
  double* green_luminance,
  double* blue_luminance
)

Description [src]

Retrieve the relevant RGB luminance constants for a babl space.

Note: these luminance coefficients should only ever be used on linear data. If your input space is non-linear, you should convert your pixel values to the linearized variant of space before making any computation with these coefficients. See #83.

Parameters

space

Type: Babl

A BablSpace.

The data is owned by the caller of the function.
red_luminance

Type: double*

Location for the red luminance factor.

The argument will be set by the function.
The argument can be NULL.
green_luminance

Type: double*

Location for the green luminance factor.

The argument will be set by the function.
The argument can be NULL.
blue_luminance

Type: double*

Location for the blue luminance factor.

The argument will be set by the function.
The argument can be NULL.