Plot three images horizontally in python

Question

I'm trying to plot three images with their subtitles above them but nothing is showing right now.

import cv2
from matplotlib import pyplot as plt

img = cv2.imread('kids.tif')

# Averaged environment
avg_blur = cv2.blur(img,(5,5))
# Gaussian filter
gauss_blur = cv2.GaussianBlur(img,(0,0),5)
# Median filter
median_blur = cv2.medianBlur(img,5)

f, axarr = plt.subplots(nrows=1,ncols=3)
axarr[0].imshow(img)
axarr[1].imshow(avg_blur)
axarr[2].imshow(gauss_blur)

"""
plt.subplot(121),plt.imshow(img),plt.title('Original')
plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(avg_blur),plt.title('Averaged environment')
plt.xticks([]), plt.yticks([])
plt.show()
"""

Add `plt.show()` at the end. It will work. :) – Poojan Oct 09 '19 at 17:46 — Poojan, Oct 09 '19 at 17:46

CypherX · Accepted Answer · 2021-10-08T11:47:17.017

8

Solution

import numpy as np
import matplotlib.pyplot as plt

%matplotlib inline
%config InlineBackend.figure_format = 'svg' # 'svg', 'retina'
plt.style.use('seaborn-white')

# Make dummy data for the image
a = np.arange(25**2).reshape(25,25)

# Show subplots | shape: (1,3) 
fig, axs = plt.subplots(nrows=1, ncols=3, figsize=(12,4))
for i, ax in enumerate(axs.flatten()):
    plt.sca(ax)
    plt.imshow(a**(i+1), cmap=plt.cm.jet)
    #plt.colorbar()
    plt.title('Image: {}'.format(i+1))

#plt.tight_layout()
plt.suptitle('Overall Title')
plt.show()

Output:

Code Similar to Your Implementation

It is easier to just set the current axis plt.sca(ax) and then plot as if you have just one subplot to deal with. This makes your code easy to modify and if need be, swiftly move into a loop.

f, axarr = plt.subplots(nrows=1,ncols=3)
plt.sca(axarr[0]); 
plt.imshow(img); plt.title('title 1')
plt.sca(axarr[1]); 
plt.imshow(avg_blur); plt.title('title 2')
plt.sca(axarr[2]); 
plt.imshow(gauss_blur); plt.title('title 3')
plt.show()

References

https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.subplot.html

edited Oct 08 '21 at 11:47

answered Oct 09 '19 at 17:56

CypherX

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@Arturo Thank you for selecting it as the `accepted` answer. Please consider **`upvoting`** the answer. – CypherX Oct 09 '19 at 18:00
I like it better in the way I have it in the comment, without the coordinates. Can you show it like that? – Oct 09 '19 at 18:05
Added a section, hope this would help you. – CypherX Oct 09 '19 at 18:31
See the examples here: https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.pyplot.subplot.html. – CypherX Oct 09 '19 at 21:23

Plot three images horizontally in python

1 Answers1

Solution

Code Similar to Your Implementation

References