win10 abort while RGBA with jpg suffix

[GuoQuanhao]

Provide environment information

I have a JPG-suffixed image in RGBA format, which caused errors in my annotations. I believe such naming mismatches are not uncommon. Instead of distinguishing between JPG and PNG based on file extensions, we should rely on PIL (Python Imaging Library) to detect the actual format.

if image_pil.mode == "RGBA":
    image_format = "PNG"
else:
    image_format = "JPEG"

What OS are you using?

win10

Describe the Bug

I have a JPG-suffixed image in RGBA format, which caused errors in my annotations. I believe such naming mismatches are not uncommon. Instead of distinguishing between JPG and PNG based on file extensions, we should rely on PIL (Python Imaging Library) to detect the actual format.

Expected Behavior

No response

To Reproduce

No response