We present an interactive graphical approach for the explicit specification of semantics for
volume visualization. This explicit and graphical specification of semantics for volumetric
features allows us to visually assign meaning to both input and output parameters of the
visualization mapping. This is in contrast to the implicit way of specifying semantics using
transfer functions. In particular, we demonstrate how to realize a dynamic specification of
semantics which allows to flexibly explore a wide range of mappings. Our approach is based …