Function leptonica_sys::convertRGBToLAB

pub unsafe extern "C" fn convertRGBToLAB(
    rval: l_int32,
    gval: l_int32,
    bval: l_int32,
    pflval: *mut l_float32,
    pfaval: *mut l_float32,
    pfbval: *mut l_float32
) -> l_ok