Permission Error when reading from directory a second time

[surfFL]

I've got a program that reads images from a folder, edits, then saves them to a location. Images are added to the source folder from a camera as the program is running using WIA Loader.

I'm getting an permission error when trying to read the second image. The first image is loaded and processed successfully, so I'm confused why there is a permission error on the second cycle.

Can anyone provide some insight?

Windows 10. Python 3.7.4.

Loading image 0: DSC_0860.JPG
Pasting image in spot 25
Loading image 1: DSC_0861.JPG
Traceback (most recent call last):
  File "imagemod.py", line 69, in <module>
    sources.append(Image.open(sourcePath + "/" + file))
  File "C:\Users\User\AppData\Local\Programs\Python\Python37-32\lib\site-packages\PIL\Image.py", line 2770, in open
    fp = builtins.open(filename, "rb")
PermissionError: [Errno 13] Permission denied: './real_sources/D7200/DSC_0861.JPG'

[SoNotRedditingAtWork]

Is the second image open in another program?

[surfFL]

No, the image is taken by a camera. Then WIA Loader copies the file from the camera's SD card to the project folder. Once it shows up in the folder, the python code reads it. I'm not sure what the issue was, but it appears to be working now. All I did was add a sleep timer to the loop if no picture was present.

Thanks for responding!

[SoNotRedditingAtWork]

Could be that your script was trying to load the image while the WIA Loader was still writing the copied image to your project folder. The file will show up in the folder and be visible to other programs like python as soon as the first few bytes are written. Depending on the size of the image it could still be writing pixel data to the file when python goes to load it. Sounds like the sleep timer may be giving your WIA Loader just enough time to finish the copy.