void write_to_socket (std::shared_ptr<Socket> override) const override;
/** @return true if our image is definitely the same as another, false if it is probably not */
bool same (std::shared_ptr<const ImageProxy>) const override;
void write_to_socket (std::shared_ptr<Socket> override) const override;
/** @return true if our image is definitely the same as another, false if it is probably not */
bool same (std::shared_ptr<const ImageProxy>) const override;