ENH: New class VtkCorrectImageBlend that blends two vtkImageData as if one was rendered on top of the another.
ENH: New class VtkTextActorWithBackground that enhances the regular vtkTextActor with a custom background color and opacity.
ENH: Remove border and padding from DrawerText. These features aren't used.
ENH: Implement DrawerText using VtkTextActorWithBackground instead of vtkCaptionActor2D.
ENH: Really use the bold property from DrawerText.
ENH: Make DrawerText bold by default.