template<typename P>
struct boost::gil::PixelConcept< P >
Pixel concept - A color base whose elements are channels. 
concept PixelConcept<typename P> : ColorBaseConcept<P>, PixelBasedConcept<P>
{
    where is_pixel<P>::value == true;
    
    
    typename P::value_type;
        where PixelValueConcept<value_type>;
    typename P::reference;
        where PixelConcept<reference>;
    typename P::const_reference;
        where PixelConcept<const_reference>;
    static const bool P::is_mutable;
    template <PixelConcept P2> where { PixelConcept<P, P2> }
        P::P(P2);
    template <PixelConcept P2> where { PixelConcept<P, P2> }
        bool operator==(const P&, const P2&);
    template <PixelConcept P2> where { PixelConcept<P, P2> }
        bool operator!=(const P&, const P2&);
};