Detection of scaling (zooming) of an imageItem

[Mr. D]

Hello everyone,

I would like to synchronize the scalings of two different ImageView Widgets. Therefore I need to detect the scaling (zooming) event of an imageItem.
I tried to use:

display1 = pg.ImageView()
display1.imageItem.scaleChanged.connect(scale_slot)

However, the signal doesn´t seem to be emitted.

How can I synchronize the to Widgets?

Thanks and best regards.