[Python] Trying to open .img file with matplotlib

I am trying to open an .img. I run the following code:

import matplotlib.pyplot as plt
from planetaryimage import PDS3Image
image = ('/Users/alyse/ldem_1024_00n_15n_150_180.img')
plt.imshow(image, cmap='gray')


I get the following error: TypeError: Image data of dtype <U46 cannot be converted to float

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