Opacity Correction

• Opacity component $o$ in Transfer Function stored with respect to a standard step size $\Delta t$
• Different step sizes $\Delta t^{\ast }$
• Dynamic step sizes
• generate pre-integrated function
• $o^{\ast }=1-(1-o{)}^{\frac{\Delta t^{\ast }}{\Delta t}}$
• evaluate after obtaining $o$ from Transfer Function
• apply before compositing`