Python Forum

Greetings,
I can't get a Python PIL script to run, get "not an image" error.
Appreciate any pointers, to resolve this.

The code is:

for (root, dirs, files) in os.walk(img_path):
    for name in files:
        img = (os.path.join(root,name))
        print(img)
        try:
            #print(' "%s" ' % img)   ### "'%s'" % 
            #img = (img)                     << 1
            image = Image.open(img) ### images are color images
            print(image)                       << 2
            #MAX_SIZE = (224,224)
            #image.thumbnail(MAX_SIZE)
            #thumb = image.resize((224,224), Image.ANTIALIAS)
            #image.save(copy_path,name)
            #print()
        except:
            print("not an image")

The files (1) are:
C:\Users\u00\inspection_images\101MEDIA_11-18-21\100_20-0653.jpg
C:\Users\u00\inspection_images\101MEDIA_11-18-21\100_20-0654.jpg
C:\Users\u00\inspection_images\101MEDIA_11-18-21\100_20-0655.jpg

The output (2) are:

Output:
<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=224x224 at 0x419DA90>
<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=224x224 at 0x419D700>
<PIL.JpegImagePlugin.JpegImageFile image mode=RGB size=224x224 at 0x419D0D0>

Please use correct tags when posting code.
This works for me

from os import walk
from PIL import Image

path = r'images'
copy_path = r'thumbs'
files = '*.png'
filename = []

for root, dir, files in walk(path):
    for img in files:
        try:
            image = Image.open(f'{path}/{img}')
            image.thumbnail((32,32))
            image.save(f'{copy_path}/thumb_{img}')
        except ValueError:
            print('Not a image')

My guess is Python doesn't like "print(image) << 2", but it could also be a FileNotFoundError or an a "PIL.UnidentifiedImageError". With the try/except we'll never know. Unless you can really recover from an error and continue working, skip wrapping code in try/except. Let Python use the default exception handler that prints informative messages describing what error happened and where it happened in your code. This is a lot better than "Not a image"

At the very least do something like this:

for (root, dirs, files) in os.walk(img_path):
    for name in files:
        img = (os.path.join(root,name))
        print(img)
        try:
            image = Image.open(img) ### images are color images
            print(image) << 2
        except Exception as msg:
            print(msg)

Better yet, use the traceback library. This program fails in so many different ways. I got useful info for each failure and it kept running!

import sys
import traceback
from PIL import Image

for a in (42, "missing_file.txt", "test.txt", "dice1.png"):
    try:
        image = Image.open(a) ### images are color images
        print(image) << 2
    except Exception:
        print("\n\nError processing", a)
        traceback.print_exc(file=sys.stdout)

Error:
Error processing 42
Traceback (most recent call last):
  File ...", line 2957, in open
    fp.seek(0)
AttributeError: 'int' object has no attribute 'seek'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "...", line 7, in <module>
    image = Image.open(a) ### images are color images
  File "...\lib\site-packages\PIL\Image.py", line 2959, in open
    fp = io.BytesIO(fp.read())
AttributeError: 'int' object has no attribute 'read'


Error processing missing_file.txt
Traceback (most recent call last):
  File "...", line 7, in <module>
    image = Image.open(a) ### images are color images
  File "...\lib\site-packages\PIL\Image.py", line 2953, in open
    fp = builtins.open(filename, "rb")
FileNotFoundError: [Errno 2] No such file or directory: 'missing_file.txt'


Error processing test.txt
Traceback (most recent call last):
  File "...", line 7, in <module>
    image = Image.open(a) ### images are color images
  File "...\lib\site-packages\PIL\Image.py", line 3008, in open
    raise UnidentifiedImageError(
PIL.UnidentifiedImageError: cannot identify image file 'test.txt'
<PIL.PngImagePlugin.PngImageFile image mode=RGBA size=97x97 at 0x198FA12E460>


Error processing dice1.png
Traceback (most recent call last):
  File "...", line 8, in <module>
    print(image) << 2
TypeError: unsupported operand type(s) for <<: 'NoneType' and 'int'