def image_props(event):
    """
    Get information for a pick event on an ``AxesImage`` artist. Returns a dict
    of "i" & "j" index values of the image for the point clicked, and "z": the
    (uninterpolated) value of the image at i,j.

    Parameters
    -----------
    event : PickEvent
        The pick event to process

    Returns
    --------
    props : dict
        A dict with keys: z, i, j
    """
    x, y = event.mouseevent.xdata, event.mouseevent.ydata
    i, j = _coords2index(event.artist, x, y)
    z = event.artist.get_array()[i,j]
    if z.size > 1:
        # Override default numpy formatting for this specific case. Bad idea?
        z = ', '.join('{:0.3g}'.format(item) for item in z)
    return dict(z=z, i=i, j=j)