How to get full size image which is transformed by warp function

[Yongda Chen]

I am trying to do geometric transformation with warp in scikit-image, but I 
cannot get the full size transformed image which has different image size 
to original image. Even after setting up output_shape parameter, it still 
lost part of image which is transformed to negative coordinates.
My question is how to get full size transformed image when doing affine 
transform, projective transform with warp function?
Following is the example code I am working on

import matplotlib.pyplot as plt
import skimage.transform import *
import skimage import data
import numpy as np

checkboard = data.checkboard()
tform = AffineTransform(rotation = np.pi/6)
checkborad_transformed = warp(checkboard, tform, output_shape=(400,400))
fig = plt.figure()
plt.imshow(checkboard_transformed, cmap = plt.cm.gray)



Thanks
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