Set output postfix for processing directories

[nicothed]

First, thank you for an amazing package!

I'm trying to process an entire directory like this:
deface "pics/" --replacewith mosaic --mosaicsize 20 --thres 0.4 --output "_mosaic20.jpg"

I tried different parameters and would like to use a different postfix for them (e.g. "mosaic20"). The issue is that the output path will be the same for all images (or I'm not understanding something).
IMO, it would make a lot of sense to add a parameter "postfix" that simply adds a specified postfix to all outputs.

[StealUrKill]

Don't add a --output. By doing so it will add a unique name for each one.

Example Input:
Test.jpg
Test2.jpg

Example output:
Test_anonymized.jpg
Test2_anonymized.jpg

See code below.

opath = f'{root}_anonymized{ext}'