Interface GrayRGBConvertible

src/core/util.rs:699–699

TODO Rust haven't stabilized trait aliases yet Trait qualifier for given type indicating conversion capability between grayscale and RGB triplets of data

/// Trait qualifier for given type indicating conversion capability between
/// grayscale and RGB triplets of data
pub trait GrayRGBConvertible: HasAfEnum {}

impl GrayRGBConvertible for f64 {}
impl GrayRGBConvertible for f32 {}