Most of the contents of this is hacky and using it to learn Python to some extent.

srm-toolkit

• cli
• addons

srm-cli

CLI tool to process red-green normal maps and extract the texture alpha channel into its own file.

You can do a --dry-run to have the tool run without making changes.

srm-cli normals --dry-run path/to/dir

srm-cli alpha --dry-run path/to/dir