image conversions

[Michael Aye]

I am working through the docs of skimage and tried out the image 
conversions.
The docs say that these functions *properly rescale* the values, but I'm 
not sure what is meant with *properly? *
*IF *rescaling is meant to exploit the defined range between 0 and 1 for 
floats, that does not seem to happen:

In [13]: data=np.uint(data)

In [14]: data.max()
Out[14]: 27

In [15]: data.min()
Out[15]: 17

In [16]: fimg = skimage.img_as
skimage.img_as_float  skimage.img_as_int    skimage.img_as_ubyte 
 skimage.img_as_uint

In [16]: fimg = skimage.img_as_float(data)

In [17]: fimg.max()
Out[17]: 6.2864273801181529e-09

In [18]: fimg.min()
Out[18]: 3.9581209430373555e-09

In [19]: imshow(fimg)
Out[19]: <matplotlib.image.AxesImage at 0xe38b1f0>

In [20]: data.dtype
Out[20]: dtype('uint32')


Or do I misunderstand something?

Best regards,
Michael
 
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