How to solve TypeError exception with matplotlib?

Question

I want to check my data and see images containing in images.npy. How to solve that type of error?

TypeError: Invalid shape (20000, 48, 48, 3) for image data

Code:

import numpy as np
from matplotlib import pyplot as plt

images = np.load('images.npy')

plt.imshow(images)
plt.show()

Your data is 4-dimensional. imshow requires 2- or 3-dimensional data. matplotlib.org/3.2.1/api/_as_gen/matplotlib.pyplot.imshow.html — RuthC
– RuthC, Commented Dec 27, 2020 at 18:20
Where oh where did the error occur. Don't just show code and an error summary! — hpaulj
– hpaulj, Commented Dec 27, 2020 at 19:09

TQCH · Accepted Answer · 2020-12-27 18:19:54Z

1

You cannot plot a 4d array that way. Try to split the first dimension 20000 into individual RGB images and then plot them using plt.subplots instead.

answered Dec 27, 2020 at 18:19

TQCH

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2 Comments

alexpleasehelpme Over a year ago

As I understand the"20000" is the number of images in file. But thank you I'll try

TQCH Over a year ago

Yes, you can treat that 4d array as a list of 20000 RGB images, and plot them separately use their indices.

Gaussian Prior · Accepted Answer · 2020-12-27 18:21:47Z

0

Try: (from https://matplotlib.org/3.3.3/tutorials/introductory/images.html)

import matplotlib.pyplot as plt

import matplotlib.image as mpimg
img = mpimg.imread('images.npy')

imgplot = plt.imshow(img[0])#plot the first -- notice you are trying to plot 20k images, not 1

answered Dec 27, 2020 at 18:21

Gaussian Prior

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