Close an image window?

This is a trivial question, but I still don't know how to do it. I've started up "ipython --pylab" and then: import skimage.io as io c = io.imread('cameraman.jpg') io.imshow(c,'qt') and this gives me an image in a window labelled "skimage". (I'm using Ubuntu 12.04). But how do I close this window from the console? I've tried: plt.close('skimage') plt.close() plt.close('all') plt.close(1) none of which have any effect. I can of course close them with the mouse, but that seems a little inelegant. Is the method to "close" the window in another package entirely? Thanks!