Function graphicsmagick_sys::MagickCompareImageChannels

pub unsafe extern "C" fn MagickCompareImageChannels(
    arg1: *mut MagickWand, 
    arg2: *const MagickWand, 
    arg3: ChannelType, 
    arg4: MetricType, 
    arg5: *mut f64
) -> *mut MagickWand