Converting numpy array to picture

Question

So I have got a string of characters and I am representing it by a number between 1-5 in a numpy array. Now I want to convert it to a pictorial form by first repeating the string of numbers downwards so the picture becomes broad enough to be visible (since single string will give a thin line of picture). My main problem is how do I convert the array of numbers to a picture?

Possible duplicate of Imshow: extent and aspect

dennlinger
– dennlinger

2018-07-02 05:56:44 +00:00
Commented Jul 2, 2018 at 5:56 — dennlinger
– dennlinger, Commented Jul 2, 2018 at 5:56

dennlinger · Accepted Answer · 2018-07-02 05:59:51Z

1

This would be a minimal working example to visualize with matplotlib:

import numpy as np
import matplotlib.pyplot as plt

# generate 256 by 1 vector of values 1-5
img = np.random.randint(1,6, 256)
# transpose for visualization
img = np.expand_dims(img, 1).T

# force aspect ratio
plt.imshow(img, aspect=100)
# or, alternatively use aspect='auto'
plt.show()

You can force the aspect ratio of the plotted figure by simply setting the aspect option of imshow()

answered Jul 2, 2018 at 5:59

dennlinger

11.7k2 gold badges47 silver badges65 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

DuttaA Over a year ago

Can you explain the expand() and the aspect 100 part?

dennlinger Over a year ago

the expand_dims simply forces the numpy array to be two-dimensional; per default, the img array is 1D (of shape (256,)), but expand dims forces it to be two-dimensional. And a scalar value for aspect simply sets the aspect ratio (either width/height or height/width) to whatever you provide.

Collectives™ on Stack Overflow

Converting numpy array to picture

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related