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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.