pub unsafe extern "C" fn MagickThresholdImageChannel(
arg1: *mut MagickWand,
arg2: ChannelType,
arg3: f64,
) -> MagickBooleanType
pub unsafe extern "C" fn MagickThresholdImageChannel(
arg1: *mut MagickWand,
arg2: ChannelType,
arg3: f64,
) -> MagickBooleanType