PIL Python

[ABVSVL]

There are two files. one file has a color depth of 24 second 32 bits.
The PIL library gives an error.
How to convert 32 bits to 24?
What are the methods for assigning values? Or can you set the depth yourself?
For example, modify the file and save as 24?

[scidam]

The PIL library gives an error.

What does it mean? PIL gives an error when you try to read a file or when you call .convert method?

[buran]

Post your code (minimal reproducible example) in python tags as well as the full traceback you get - in error tags