mirror image in python

Question

I want to mirror an image in python but this error occur

Exception has occurred: IndexError
index -751 is out of bounds for axis 1 with size 750
File "D:\PART 1\Miror.py", line 20, in <module>
d=img.item(i,mn,0)

this is my code

img = cv2.imread('D:\\PART 1\\gwk.jpg')

tinggi = img.shape[0]
lebar  = img.shape[1]
brightness = 100
nm=int(tinggi-1)
mn=int(lebar-1)
lebarBaru= int(lebar/2)
tinggiBaru= int(tinggi/2)
for i in np.arange(tinggiBaru):
for j in np.arange(lebarBaru):
    a=img.item(i,j,0) 
    b=img.item(i,j,1) 
    c=img.item(i,j,2) 
    d=img.item(i,mn,0) 
    e=img.item(i,mn,1) 
    f=img.item(i,mn,2) 
    img.itemset((i,j,0),d)
    img.itemset((i,j,1),e)
    img.itemset((i,j,2),f)
    img.itemset((i,mn,0),a)
    img.itemset((i,mn,1),b)
    img.itemset((i,mn,2),c)
    mn-=1

I want to mirror an image in python without using OpenCV function for mirroring an image

Answer 1

Just invert the direction of one (or both if you like) dimensions of the image array.

Example with imageio, but should work the same with similar image arrays, too, like e.g. in opencv:

import matplotlib.pyplot as plt
import imageio
im = imageio.imread('imageio:chelsea.png') 

fig, axs = plt.subplots(1, 3, sharey=True)

axs[0].imshow(im)
axs[1].imshow(im[:, ::-1, :])
axs[2].imshow(im[::-1, :, :])