gcpGetLuminance(3)

NAME
gcpGetLuminance : Manipulate Luminance

SYNOPSIS
#include <ggi/gcp.h>
ggi_float gcpGetLuminance(ggi_visual_t vis, const gcp_pixel pix);

DESCRIPTION
gcpGetLuminance calculates the luminance of the pix pixel.

RETURN VALUE
gcpGetLuminance returns the luminance of the pixel.