reading hand signature

There are 2 images in the pdf which i am trying to read,
1st is the logo.
2nd is the handwritten Sign.
The library is able to read the logo and convert to image using pillow.
but the issue comes when it tries to read the handwritten sign ,it spits out below error:

im = page.images[1].as_pil()
Traceback (most recent call last):

  File "<ipython-input-77-93f421217555>", line 1, in <module>
    im = page.images[1].as_pil()

  File "C:\Program Files\Anaconda3\lib\site-packages\minecart\content.py", line 363, in as_pil
    "Colorspace %r is not supported" % colorspace)

PDFNotImplementedError: Colorspace 'PDFObjRef:100>' is not supported

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python version used : Python 3.5.2 :: Anaconda 4.2.0 (64-bit)