cannot identify image file 'Rec-000026_16bit_counts.tif'

I = plt.imread('Rec-000026_16bit_counts.tif')
plt.show(I)

---------------------------------------------------------------------------
UnidentifiedImageError                    Traceback (most recent call last)
<ipython-input-63-0e80e7a09c7a> in <module>
----> 1 I = plt.imread('Rec-000026_16bit_counts.tif')
      2 plt.show(I)

~/anaconda3/lib/python3.7/site-packages/matplotlib/pyplot.py in imread(fname, format)
   2059 @docstring.copy(matplotlib.image.imread)
   2060 def imread(fname, format=None):
-> 2061     return matplotlib.image.imread(fname, format)
   2062
   2063

~/anaconda3/lib/python3.7/site-packages/matplotlib/image.py in imread(fname, format)
   1462             raise ValueError('Only know how to handle PNG; with Pillow '
   1463                              'installed, Matplotlib can handle more images')
-> 1464         with Image.open(fname) as image:
   1465             return pil_to_array(image)
   1466     from matplotlib import _png

~/anaconda3/lib/python3.7/site-packages/PIL/Image.py in open(fp, mode)
   2929         warnings.warn(message)
   2930     raise UnidentifiedImageError(
-> 2931         "cannot identify image file %r" % (filename if filename else fp)
   2932     )
   2933

UnidentifiedImageError: cannot identify image file 'Rec-000026_16bit_counts.tif'