ImageVmin#

ImageVmin(value[, property_name])

lower contrast limit

Graphic Feature value, must be implemented in subclass

`ImageVmin.add_event_handler`(handler)	Add an event handler.
`ImageVmin.block_events`(val)	Block all events from this feature
`ImageVmin.clear_event_handlers`()	Clear all event handlers
`ImageVmin.remove_event_handler`(handler)	Remove a registered event `handler`.
`ImageVmin.set_value`(graphic_or_key, value)	wraps GraphicFeature.set_value