Differentiating between a PIL and CV2 image in python ?

• Yogesh Kumar
• 03-May-2022
• 0

When you open an image using CV2 then it returns object of the type numpy.ndarray but PIL's Image.open() returns PIL.JpegImagePlugin.JpegImageFile. So using that, you can basically differentiate which is used in your case (assuming there is no conversion or further processing involved which converted one image type to another).

 import cv2
from PIL import Image
from PIL import JpegImagePlugin

imgcv = cv2.imread('./koala.jpg')
print(type(imgcv))

imgpil = Image.open('./koala.jpg')
print(type(imgpil))

img = imgpil
if isinstance(img,JpegImagePlugin.JpegImageFile):
    print('PIL Image')
else:
    print('Not PIL') 

Output:

 <class 'numpy.ndarray'>
<class 'PIL.JpegImagePlugin.JpegImageFile'>
PIL Image 

As mentioned in the comment of this answer (by Mark Setchell) that instead of changing the PIL's JpegImageFile class, we can also check ndarray check and then decide - since PIL's class might change in future or they may simply use different type. The check would be exactly the same though.

 img = imgcv
if isinstance(img,numpy.ndarray):
    print('CV Image')
else:
    print('PIL Image')

* Be the first to Make Comment