Enumeration: AnnotationVisibilityType
Specifies whether IAnnotations are visible, transparent, or not visible.
This is specific to the image viewer and does not apply to document productions or Save As PDF
Enumeration Members
Hidden
Hidden: "hidden"
Annotations are hidden at 0% opacity.
Transparent
Transparent: "transparent"
Annotations are transparent at 30% opacity.
Visible
Visible: "visible"
Annotations are fully visible at 100% opacity.