尝试将目录中的图像从 JPG 转换为 PNG 文件时出现“FileNotFoundError: [Errno 2] 没有这样的文件或目录”

Question

I am new to Python, and I am trying to convert all images in my file (JPG) to PNG format.

I am using this code:

from PIL import Image
import os

#Image directory
directory = "D:\\weeds"

for filename in os.listdir(directory): 
    if filename.endswith(".jpg"): 
        prefix = filename.split(".jpg")[0]
        im = Image.open(filename)
        im.save(prefix+'.png')  
    else: 
        continue

However, the following error is generated:

---------------------------------------------------------------------------
FileNotFoundError                         Traceback (most recent call last)
<ipython-input-26-871d84dccfb2> in <module>
      7     if filename.endswith(".jpg"):
      8         prefix = filename.split(".jpg")[0]
----> 9         im = Image.open(filename)
     10         im.save(prefix+'.png')
     11     else:

~\lib\site-packages\PIL\Image.py in open(fp, mode)
   2876 
   2877     if filename:
-> 2878         fp = builtins.open(filename, "rb")
   2879         exclusive_fp = True
   2880 

FileNotFoundError: [Errno 2] No such file or directory: 'weed0.jpg'

This image is clearly in my directory:

How can I fix this error, and convert all JPG images to PNG?

Answer 1

The problem is os.listdir gives you the leaf file names. It does not give you the full paths. For example, in your case, the directory is "D:\\\\weeds" , so any results from os.listdir would give you names such "foo" or "bar" but not "D:\\\\weeds\\foo" . In order to use the results of os.listdir from any working directory, you need to use os.path.join with "D:\\\\weeds" to form the full, correct path.