displaying image with imshow in python -

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i construct image follows

   import numpy    im = numpy.zeros((100,100,3))    im[:,:,0] = rdata    im[:,:,1] = gdata    im[:,:,2] = bdata

when show data using imshow follows

  imshow(im)

it not display correct result.

but if following 

  scipy.misc.imsave("temp.png",im)   nimg = scipy.misc.imread("temp.png")   imshow(nimg)

the image displayed correctly.

i not sure issue, there type problem, data mean normalized.

thanks


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