How do you read a 32-bit TIFF image in python?

Question

I want to read 32-bit float image files with python to do some image analysis.

I have tried

import matplotlib.pyplot as plt

im = plt.imread('path_to_file.tif')

But, this only reads the data as 8-bit integer values. Is there a way to provide imread() with the right data type?

-- Well, it formerly worked out of the box with 16-bit TIFF files, but doesn't with 32-bit floats.

Tonechas · Answer 1 · 2016-12-09T00:38:36.177

11

I experienced a similar problem trying to read single-channel 32-bit integer images. The solution I came up with was:

from skimage import io
im = io.imread('path_to_file.tif')

If you have OpenCV installed on your computer you could also try:

import cv2
im = cv2.imread('path_to_file.tif', -1)

Hope this helps

edited Dec 09 '16 at 00:38

answered Dec 09 '16 at 00:27

Tonechas

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It worked fine using skimage but I get a NoneType when using opencv (using python3.6) – ma3oun Jul 25 '18 at 08:24
What version of OpenCV are you using? – Tonechas Jul 26 '18 at 08:01
I'm using opencv 3.4.2 with python 3.6 from Anaconda 3 (5.2.0) – ma3oun Jul 26 '18 at 08:31
Could you share your image through Dropbox, Google drive, etc... ? – Tonechas Jul 26 '18 at 09:21

score 4 · Answer 2 · answered Feb 27 '20 at 15:00

4

This worked for me (the key flag being IMREAD_ANYDEPTH):

cv2.imread(fullImagePath, flags=(cv2.IMREAD_GRAYSCALE | cv2.IMREAD_ANYDEPTH))

I found it here: https://github.com/opencv/opencv/issues/7025

answered Feb 27 '20 at 15:00

John Walthour

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score 3 · Answer 3 · answered Nov 22 '16 at 20:59

I found a way via PIL, which is:

from matplotlib import pyplot as plt
from matplotlib import cm

from PIL import Image
from numpy import array

im = Image.open('path_to_file.tif')

ncols, nrows = im.size
ima = array(im.getdata()).reshape((nrows, ncols))
plt.imshow(ima, cmap=cm.Greys_r)

May be that helps someone.

S

How do you read a 32-bit TIFF image in python?

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