some comments

[migube]

hi JLDevops & tx for this code.

the dependency are not uptodate but after manualmly adding them it worked out for me. (do you plan to update it once?)
I tested the tool on French comics, but didn't have good results
atm I end up and get better results (still need to test) with
regex_pattern = re.compile(r"ISBN[0-9]+|ISBN:[0-9]+", re.IGNORECASE)
x = re.search(regex_pattern, data.replace('.','').replace('-','').replace('—','').replace(' ',''))

note that a -verbose option would be nice for debugging :) (I print data)
also deleting the temp tiff files would be nice :-p
and checking that the resulting ISBN has the correct nr of digits, else tell to manually check for errors?

tx