image-difference | Create image differential between two images | Computer Vision library

I realized my previous answer was incorrect & overly complicated (It relies on node creation order, also there's no need to add fields to imageSharp nodes. Here's the link if someone's interested.). Here's the better answer:

Since the hero image is always at the same directory as the markdown file, we can simply query it based on its directory.

The problem is that you added a default value to the arguments you add, but didn't set required=False. This means the program will throw an exception when parsing the arguments, unless you invoke it with the actual -f/--first and -s/--second.

The solution is to either:

1. Set required=False in both add_argument calls, since you provide a default. That way, you can call python my_script.py and it will use the default provided.
2. Invoke your program by providing the two CLI options: python my_script. py -f some_file.png -s some_other_file.png