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pythonnumpyscikit-image

ValueError: Image is not numeric, but ndarray

I'm trying to save a sci-kit image, but I'm getting the error:

ValueError: Image is not numeric, but ndarray.

Code:

from skimage import *
import skimage.io
import skimage.morphology as morphology

def loadImage(f):
    return skimage.img_as_float(skimage.io.imread(f))

img = img_as_bool(loadImage("images/metric_map_processed.PNG"))

imgSk = morphology.medial_axis(img)
skimage.io.imsave("medial.png", imgSk)

According to the docs, the passed in array should be a ndarray, so why am I getting an error?

Solution

  • Just realised that my image was being converted to binary

    Replacing

    skimage.io.imsave("medial.png", imgSk)

    with 

    skimage.io.imsave("medial.png", img_as_uint(imgSk))

    worked for me