'This test passes, but when running all tests causes a failure due
to output on stderr from the error thrown by libtiff. We need to
capture that but not now'

def xtest_bw_compression_w_rgb(self):

    im = hopper('RGB')
    out = self.tempfile('temp.tif')
    self.assertRaises(IOError, (lambda : im.save(out, compression='tiff_ccitt')))
    self.assertRaises(IOError, (lambda : im.save(out, compression='group3')))
    self.assertRaises(IOError, (lambda : im.save(out, compression='group4')))
