How to use pillow library to access image files in sub-directories recursively? - python-imaging-library

Question

I want to crop and resize multiple images in many sub-directories. The code works if the images are in the same directory, but fails to read from other directories.
I have tried using os.walk() module. It successfully iterate the files from all subdirectories, but the pillow's Image.open() function fails to access the images and thereby displaying error: "image.." not found.
import os
from PIL import Image
for dirpath, dirnames, files in os.walk('.'):
for filename in files:
t = filename.split(".")
ext = t[-1]
if ext in ["jpg"]:
print(filename)
coords = (500, 250, 810,720)
image_obj = Image.open(filename)
cropped_image = image_obj.crop(coords)
resized_image =cropped_image.resize([227,227])
# name = "./data2" + str(i) +".jpg"
resized_image.save("new" + filename)
I expect the code to recursively crop and resize the images in all the sub-directories. The following error occurred.
frame0.jpg
Traceback (most recent call last):
File "........./data2/cropitall.py", line 18, in <module>
image_obj = Image.open(filename) #path of image to be cropped
File "C:\Python36\lib\site-packages\PIL\Image.py", line 2652, in open
fp = builtins.open(filename, "rb")
FileNotFoundError: [Errno 2] No such file or directory: 'frame0.jpg'
Process finished with exit code 1

Answer 1

To open the image you need the entire path to the file, not just file name.
Instead of
image_obj = Image.open(filename)
do
path = os.path.join(dirpath, filename)
image_obj = Image.open(path)