x=, y=, z=??

Dear all,

I am coming back to an issue for which I didn't get a direct answer
(except for a very nice module from Angus McMorland!):

- at the moment different backends in mpl automatically provides, when
an image (or a plot) is displayed with e.g. imshow (plot), the
coordinates x and y directly in the toolbar.

- When it is indeed an image wich is displayed, it would, in my opinion
makes a LOT of sense to also display the "z" coordinate, namely the
'intensity' value of the pixel of the image on which the cursor is

The questions are then: does this also make sense to you, and if yes,
would it be possible for someone to implement it as an intrinsic feature
of mpl backends? (I am not competent to answer the feasibility part
here, although the module Angus nicely provided on the list is an
excellent example, even if it adds one more layer which may be avoidable).

thanks for any input here!